Some fairly juicy stuff in here. Not spoilery.

Battle.net Functionality:

Supported Languages:
This was included in the menu strings.

English
English (British)
Southeast Asia
Spanish
Spanish (Latin American) (They mean 'mexico')
French
Italian
German
Korean
Brazilian Portuguese
Russian
Chinese
Label_zhTW Chinese
Turkish
Polish
Portuguese
ChangeLocaleWarning Changing the Locale requires restarting the game. Proceed?
LocaleSelectionTitle Locale Selection:
RegionSelectionTitle Region Selection:


RegionNorthAmerica North America
RegionEurope Europe
RegionKorea Korea

Hall of Fallen Heroes (There's an "archive" button after the HC hero dies). This is a tab in your profile.
Archive Hero
Are you sure you want to move {s1} to the Hall of Fallen Heroes?
Delete Fallen Hero
You may still archive this hero in the Hall of Fallen Heroes. Are you sure you want to delete {s1} permanently?
Save
You have reached the maximum number of fallen heroes. Visit the Hall of Fallen Heroes and remove some heroes first.
View
HeroSelectCantArchiveHardCoreHeroDueToLevel Fallen Heroes must be at least level 10 before you may save them to the Hall of Fallen Heroes.

Tracked stats:

LevelReached Level Reached:
SlainBy Slain By:
DamageType Damage Type:
MonstersKilledHOF Monsters Killed:
PlayerStats Player Stats
AchievementPoints Achievement Points:



You can undelete characters you've deleted:
Restore Hero
Do you wish to restore this deleted hero?
Restore
Replace Hero
Hero Limit Reached
There is a 10 hero limit for every Diablo 3 account. To restore your deleted hero, you must replace an existing hero.
Restore Hero

No Quests available in your level range. Please play through the campaign to unlock quests.

I...don't know what to say about this:
You have used up your prepaid time for this account. Please visit Battle.net Account Management to purchase more time to continue playing (ERROR_318000).
ERROR_318001
Your game account subscription has expired. Please visit Battle.net Account Management to purchase more time (ERROR_318001).

Something I'll likely be seeing shortly after release:

Your account has been banned due to multiple violations of Battle.net service policies.
Please check your registered email address for more information (ERROR_318002).

Your account has been suspended due to violations of Battle.net service policies.
Please check your registered email address for more information (ERROR_318003).

You were removed from the service by an administrator (ERROR_318200).

You were removed from the service by an administrator (ERROR_318201).

****ing queues!
GameQueue_ServerQueueDialogTitle Server Queue
GameQueue_ServerQueueDialogDescription {s1}. You have entered the queue. {s2}
GameQueue_DiabloServerFull Diablo III servers are full.
GameQueue_EstimatedWaitTime Estimated Wait Time: {s1}
GameQueue_LeaveQueue Leave Queue
GameQueue_LeaveParty Leave Party
GameQueue_LeavingQueueDialogTitle Leaving Queue
GameQueue_LeavingQueuePartyDialogDescription Leaving the queue now will take your entire party out of the queue. Attempting to start a new game will place you at the end of the queue.
GameQueue_LeavingQueueSoloDialogDescription If you leave the queue, starting a new game will place you at the end of the queue.
GameQueue_Continue Continue
GameQueue_TimeUnkowned Queuing...
GameQueue_LeavingQueuePartyMemberDialogDescription Leaving the queue now will take you out of the queue and you will leave your party Attempting to start a new game will place you at the end of the queue.

Are they planning on being as mediocre as possible when it comes to service?

Trial mode:
TrialUpgradeAtAnyTime upgrade at any time
TrialUpgradeNow Upgrade Now!
TrialChatMessage You may {s1} for more quests, higher levels, and more challenging monsters and game modes!
TrialThanksForPlaying Thanks for playing the Diablo III Trial Edition.

TrialTitle Upgrade Diablo III
UpgradeButton Upgrade
UpgradeNow Upgrade Now
TrialDialogText Thank you for playing Starter Edition. You may continue to play but need to upgrade in order to enjoy new quests, higher levels, and more challenging monsters and game modes.
TrialBannerDescriptionLine1 Click your way to 60!
TrialBannerDescriptionLine2 Challenging Bosses!
TrialBannerDescriptionLine3 Nightmare, Hell & Inferno Mode!
TrialPlayerNotLegal It is not legal for a Starter Edition player to join this game.

Wow, way to market, guys.

A lot of banner sigils were added. Probably about 25-30. Including "Eye of Anu", "Minion of Hatred", "Fallen Angel", "Butcher's Cleaver", "anguish", "Fallen Lunatic" (!!!), "Wanderer" (hooded face is the sigil description, making a note to myself), "Khalim's Will", "Maiden of Lust", "Deceiver", and "Lord of Hell" (Azmodan), amongst many others.

New toast:
LongPlaytimeWarning You've played {s1}. Excessive gameplay can cause inconvenience in your daily life



Monsters:

MonsterAffix_JailerCast_0_desc You are immobilized.
MonsterAffix_JailerCast_0 Jailer

This is an affix that was introduced in, I believe, Patch 10. I guess that explains what the jailer mod does. Sounds annoying!

Two more new ones: Shielded, and Shaman.

Item Affixes:

Some new ones.
Damage Versus Elite, Damage reduction versus elite, reduced level req, bleeds (among the list that Blizzard had in the patch notes). Also added sockets back to amulets. Indestructible is now an affix. No zod required. What's hilarious is that there's 12 ranks of it. So one item can be more indestructible than another?


Random Stuff:

"Development Hell" has now been renamed to "QA Hell" so apparently they're doing their final pass on the game. This is sheer speculation. There were "development hell" dungeons (the defiled crypt, you could actually see this in the emulator) and now the strings match the exact same locations, and the original development hell dungeons are removed. They've been replaced with QA dungeons.

Previously QA has been attacking modifiers, particularly weapon effects like stun, bleed, prevent heal, things like that. I don't see what they're doing in these strings, but apparently they're on their own schedule now for testing the game in other areas.

NPC Flavor text:

Guard Morgan
Now, there's guards in A3, obviously, due to the setting. What's been itching at me is that there's also files for diablo where it says "morgandiablo_xxxxx", x being a variable label. Is morgan an equestrian term?

Selathiel, Angiris Scribe
This is probably used for lore books for the angiris council or something.

RewardTypeVanityTitle Vanity Title
SummaryFeatOfStrengthProgress Feats of Strength: {c#FFFFa300}{s1} Nothing too surprising here. Feats of Strength are achievements that don't reward points, but likely are limited either by time or context. IE, a feat of strength achievement would be attending blizzcon, getting the CE, logging in on the day of the fifth anniversary of D3, etc.

For you football (American) fans:
Triune_Berserker_B_G_Unique_01 Manning the Giant
Triune_Berserker_B_G_Unique_02 Jacobs the Giant
Triune_Berserker_B_G_Unique_03 Bradshaw the Giant

Simplified tooltips for every rune are now in the game.










Spoilery things:

Spoiler


RMAH crap last because I truly don't care:

ErrorExceededSoftCap Your Battle.net Balance is over the allowed limit. Please use a different Deposit source.
ErrorApproachingSoftCap You are approaching the Battle.net Balance limit of {s1}.
ErrorApproachingSoftCapNoAuth You are approaching the Battle.net Balance limit of {s1} for accounts without a Battle.net Authenticator.
ErrorBuyoutExceedsSoftCap The Buyout price you set will exceed the allowed Battle.net Balance limit.
Please set a lower amount or change your deposit source.
UnderManualReviewTooltip Pending transaction, please check your Battle.net email address for more details.

ConfirmSecurityCode Confirm Security Code
SecurityCode Security Code:
SecurityChallengeDescription Your bid requires confirmation of the security code found on the credit card associated with this payment method: {s1}.