Personally I'm really hoping they're able to go back and do a JL/JLU movie or two.
Well
Just League: Worlds Collide continues to be tossed around as a possibility, and Bruce Timm has said he'd like to return to his own animation style, so getting a JL/JLU movie is a possibility. Of course, at 6 months/movie and two confirmed projects in the pipeline it's going to be a while before we see a JL movie.
If I had to speculate on future dates/titles I'd probably say:
7/09: Green Lantern
2/10: Public Enemies
7/10: Aquaman or Flash
12/10: Green Lantern (Tied into the theatrical release), possibly Sinestro Corps War
6/11: Batman (Tied into theatrical release)
2/12: Justice League: Worlds Collide
The exact dates could vary a little based on marketing needs and other releases, and obvisoulsy this is all speculation, but I think this matches the general approach we've seen so far.
The only title really missing from this list is a solo Superman title. Personally, I'd love to see one, but unfortunately I haven't even seen any rumors one is under discussion.