Updated the first post with info from the cover of the PHB2 - that it will contain Arcane, Divine, and Primal heroes, and that it shows a Goliath and what could be a Gnome or a Shifter on the cover.
Also removed this bit, since I can't find any significant meaning in it:
Scott Rouse says "The license is done but late yesterday we added a bunch of new stuff to the
SRD to cover some books coming out next year (like PH2 classes, power sources, and weapons)." (
source) When someone complains, he asks "So do you want Psionics now or 12 months from now?" (
source) However, the released
SRD doesn't seem to include anything from future products.
Also, while ENWorld was down I copied the first post over to the Summer Camp at
http://www.circvsmaximvs.com/showthread.php?t=45770.