I live in Australia, and like most people import all my games from overseas/buy online because Aus retailers completely price gouge consumers in our country. I looked at a copy of Diablo III on ozgameshop and it has a note
Please Note: This is the European version of the game. Diablo III will not be region locked, you can select any region to play in but RMAH will be region locked..
I'm wondering if this means I'll only be able to trade with people in Europe or not at all, surely I would think I would be locked by the address on my b.net account and not the location the CD key was purchased? Can anyone clarify this?
Nope, no one can because Blizzard have yet to clarify it.
My bet is on any locking being based purely off your Battle.Net location, but it hasn't been confirmed or denied yet.
I wish I could have posted this on the official forums but they don't' allow anyone who isn't in the beta to post (ridiculous). If there is anyone here in the beta who could re-post my question and hopefully get a blizzard reply that would be really helpful