First let me begin by saying this...
Do I like the idea of a WD over a Necromancer? NO, I have always loved necromancers.
Do I firmly believe WD's will have the ability to raise an undead army? YES, If indeed the WD has replaced the Necromancer(which I am willing to bet it has) then I am sure there will be an extensive summoning line of abilities.
What is driving me nuts is that there are tons of people assuming that the WD now has "dogs" instead of skeletons and that in general the WD will be crap compared to a Necromancer.
Here are two things from the gameplay video we know: One of the WD's lowest level summons is an undead dog(Which can be summoned multiple times), the second is that Blizzard HAS PUT MORE TIME INTO PETS. This is clearly shown from the fact the WD can buff his pets with his spells and use them as walking bombs.
Just because the WD's lowest summon are dogs does not mean there wont be zombies/skeletons/horrific undead creatures at the WDs command. My point is this, we have seen a small taste of the WD. In the small taste we were given by Blizzard there was a large emphasis on three things: Summons, Fire spells, and Curses.
Now, all the WD haters can assume Blizzard doesnt know what they are doing and the whole WD summoning line will consist of undead dogs or you can logically see that Blizzard's emphasis on pets and their abilities is greater in D3 than it was in D2. I would rather people just stop assuming, however if people are going to assume then the arrows point to the WD commanding a bigger, badder, and greater army of pets the likes of which all necro fans will drool over.
On a side note, and this is me speculating, I think they went with the Witch Doctor because a Necromancer would have been to close to what I believe will be one of the other 3 classes, an anti-paladin type death knight class.
Mad Mantis Props to you for your WD posts on summons many of those inspired me to go ahead and write this.
Thanks for letting me vent,
Resented