Not much more details, other than a "late spring 2013" release window.
Are you excited? Indifferent? I loved the first game, hopefully they'll stick to that winning formula.
EDIT: News are soured a bit, since apparently the creator of the original game, George Fan, was one of the employees at Popcap who lost his job yesterday. Which is sort of odd since they, well, revealed Plants vs. Zombies 2 the day before the layoff announcement. This according to Edmund McMillen (indie developer) on his Twitter.