The game's being developed by Grasshopper Manufacture in conjunction with Digital Reality. Apparently it's a horizontal shoot 'em up. The game won't be the first venture between Grasshopper and Digital Reality; apparently they have "a range of other titles" in the works.
The game's scheduled for Q3, 2011 so it's some way off. It'll support stereoscopic 3D. Suda joked that due to the lack of huge announcements at GamesCom "this is going to be the biggest announcement" of the show. Resistance 3 says "hi", Suda.