Like what? In the video I just watched it was confirmed that the underlying gameplay code is the same as the original. So the engine performing AI/Combat/Movement is the original (mostly) and on top of that they have layered another engine bringing forth the graphical benefits. As such it is possible during gameplay to flick between the original series graphics and the new enhanced ones.
Past that I believe there are additional modes available as well as the ability to play co-op through the original campaign over live using drop-in/out connections with your mates.