The following current titles are missing from the relaunch (apart from Batman Beyond and Batman, Inc., which we know will be relaunching at some point):
Adventure Comics
Booster Gold
Doc Savage
Gotham City Sirens (although the characters are all accounted for in other titles)
Justice Society of America
Power Girl
Red Robin
Secret Six
The Spirit
Superman/Batman
T.H.U.N.D.E.R. Agents
Zatanna
I wonder if they could (not that they should) roll Doc Savage into the greater DCU. He's a licensed character, I think, so that would be problematic. I can see Doc Savage and The Spirit being gone for good.
T.H.Under Agents (I got tired of the periods)... hm... roll it into the DCU? Was it already?
Zatanna is gonna be in JL Dark, so she won't have her own book.