Superman/Doomsday trailer:
http://youtube.com/watch?v=eTf-VzgAWaE
Supposedly these new animated movies were supposed to be based on the look and art of the comics from which they are based. But the animation looks just like Justice League Unlimited, with a few changes (Lois looks slightly different).
Looks like the story is gonna be radically changed too. Aside from Superman and Doomsday fight and "kill" each other.
On the other hand, based solely on that little line Superman says at the end, The Man Called Jayne is gonna do a good job voicing him.