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Summary from Gainax panel at Fanime:

-Gurren Lagann will have two movies, they will use mostl new footage with very little reused animation.
-The Gurren-Lagann movie wil surprise everyone, they can't say anything about it or Imaishi will get angry.
-Akai never resigned, he actually worked on GL from beginning to end and it is actually his favorite work from the company and feels embarassed of the rest.
-They're working in 2 new projects, one for the far future about an English rocker and another for this Fall.

Addendum: If my sources are right, the fall project it's a Gangan manga adaptation sponsored by Square-Enix, just like Bones with Fullmetal Alchemist and Soul Eater. The title is Shikabane Hime.