Looks like it will be coming out December 20, 2011 in NA and December 22 in Europe.
Just a couple quick points;
Funny how it came the day after Blizzard's announcement that Diablo III was delayed until 2012. They could have released it any time in December, so judging by the late release date it was probably just a coincidence.
That release date is way too close to Christmas. The logistics for this are going to be brutal, and I'm willing to bet that they're not fully prepared. I'm not concerned about the number of users playing the game, Christmas is actually a pretty slow period considering all of the other activities taking place. I do have a slight concern about the technical side (stability during stressful load), but where I'm most worried is their own Customer Service department. It's going to be a nightmare managing the employees, making sure they have enough, and planning ahead for the 50% of staff that won't be showing up during the Christmas break (even though they're scheduled.) It will be even worse even if their Customer Service team has been outsourced.
I'll try to remember to monitor forums around the time of release (I'll be busy myself), and see how their Customer Service fairs. I think it's going to turn out very bad though, you should never release a game close to a major holiday, and it will be a good learning experience for them and other companies.
I haven't decided yet if I'm going to buy the game or not.. it's very tempting, but I'm trying to give up subscription based MMOs.