Still little known beyond that right now
It would appear that the first real confirmation of what Respawn is working on has been made by Frank Gibeau of Electronic Arts. Gibeau confirmed that Respawn is working on a sci-fi shooter. It is thought that it will be something to rival the Halo and Gears of Wars franchises.
The new Respawn title will be looking for an opportunistic window for release that will fit in with the alternating Battlefield and Medal of Honor release schedule that will be moving to an annual format going forward. The studios working on the games will have a full two-year cycle between releases.
There is no word yet on when Respawn will make an announcement on the specifics of their title, and we have no clue how far along it is in development. Still, we are hearing that the title is poised for a 2012 release.