Where's Leo?

It's like Leonardo makes a bunch of movies together and then disappears for awhile. Has anyone heard of anything in the works with him?

This is what he is doing:

Untitled Alexander the Great Project (2005) (in production) .... Alexander, the Great
Good Shepherd, The (2004/I) (pre-production) .... James Wilson
Aviator, The (2004) (post-production) .... Howard Hughes