I was in the last beta and it is f*cking awesome.
Thing to remember - and going by the in game chat, most people didn't - is that you're there to test it out, you're not given a free version of the game. So expect bugs, incompletions etc. Some of the NPCs had robot voices for example but in the final game they'll all be fully voiced.
Another thing to remember is that your character won't carry over if you buy the game, so don't worry about leveling etc. Just have fun
I'll double check my username on there and post for you guys, this is the first MMO i'm playing from the start so trying to get into the whole group aspect of it as well...