Ahh! Thanks for pointing this out, i'd been looking for this. Tried it last night and it was alright. It's pretty (and the 3D was pretty good), but I'm not sure.
motorstorm apocolaypse demo is back up on the eu psn store.
It felt like motorstorm- but the vehicles seemed to take a bit more damage before crashing. The "natural disaster" style stuff in the demo was underwhelming in comparison to Split/Second, and half of the time the event resulted in me slamming into a wall because the camera moves to show you what happens (it's optional, but i kept hitting it).