A virtual flood of info has just been released by Anet today. They were releasing at a steady trickle but today they dumped a huge amount of viable info on things such as underwater combat and dungeons.
This is just what was released today, there has been more over past months just thought i would post this as it was so much.
they are also having a hands on test right now with some fans check their twitter at https://twitter.com/#!/GuildWars2/gw2fanday
for up to date info and pics from in game.