Sadly i think Haruhi 2 wont be out for another while, due to they are airing Clannad at the moment
whichi love it
I also heard rumor and saw some videos of what Haruhi 2 is actually about... This is may not be true now...
I think the second season is calll 'The Disappearance of Suzumiya Haruhi' . It is also the name of one of the light novel. I think it was something happen , haruhi disappeared. Kyon tried to save her, so He went back to 3 years ago with Mikururu ... to find out what exactly happen 3 years ago...
And thats all i heard .... look forward to it ^^