A supposedly leaked release list from publisher Warner Bros, is making the rounds on the internet and it includes F.E.A.R. 3 and Scribblenauts 2. Interestingly enough Scribblenauts 2 is listed not only on Nintendo DS, but also on PC and Wii. A game called Batman: The Brave and the Bold is also listed, but rather than a sequel to Rocksteady Studios' awesome Batman: Arkham Asylum it is likely based on the most recent animated series.
Obviously nothing is confirmed at this point, but it would be a surprise if we did not see sequels for F.E.A.R. 2: Project Origin and Scribblenauts.