Looks like they are going for a minimalist style of animation, perhaps focusing more on the movements and characters than anything in the background/foreground?

It's just so barren and empty, which is the same feeling I got from that preview clip months ago where the Decepticons guards were jumped from above.

Computers can render more polygons and better textures faster than ever before, but it looks like neither will be used in large amounts in Prime.

Better hope it has a good story to support it.