This is a great quick list of the scifi movies in the pipeline. All sorts of great movies are under production, including: The Hobbit, Star Trek XI, Chronicles of Narnia: Prince Caspian, Indiana Jones IV, Wall-E (Short Circuit III animated?) The Day the Earth Stood Still (remake w Keaunu Reeves), The Mummy III, and Logan's Run (a remake).
I'm particularly looking forward to Logan's Run, but if War of the Worlds is any indication, it'll be quite different than the original.
There's even rumor of a new Tron sequel! Tron has always been on of my favorite movies. I just added the poster to my wish list ($6 at amazon.com).