Most of what that would be expected of World at War's engine would be back, including dismemberment of enemies etc....though the engine is improved from what i've read.
that aside, the DEBUT trailer has got me jacked for its release. considering it features an interrogative/torture scenario where ''you'' are forced to recall and divulge information over previous black ops missions, till the point your heart stops and a cold sinster voice orders you to be revived, (for further torture...doh')...
you can check out the trailer from the official site HERE.