Just saw this preview on Kotaku.
Side scrolling, Metroid-esque, with more focus on combat. Grappling hook, usable on enemies as well as environment.
And maybe the coolest part of the video? Watch the split-screen tech. It splits and rejoins as necessary, with the dividing line rotating to orient the direction you are from your teammate.
No publisher or release date yet, but developer hopes to release on XBLA, PSN and Steam all 3. Nice for those of us still wishing Shadow Complex would come out on Steam.