User blog comment:Bovell/Treyarch begins staffing for next project. MW3 announcement next month./@comment-120.28.64.77-20110331055726/@comment-1985896-20110331101237

BO's engine was an upgraded version of Waw's, wich was an upgraded version of CoD4's. That engie was upgraded to IW4.0 for MW2, so i'm pretty sure they'll use an upgraded version of that.

And of course they're gonna use motion capture again, it's in almost every game.