According to Variety:
DreamWorks Animation has hired "Lilo & Stitch" director Chris Sanders, a longtime Disney vet, to helm its cavemen comedy "Crood Awakenings." The talent coup is reminiscent of the competition for animators in the mid-'90s.
DreamWorks had been developing "Crood" with Aardman, but took it inhouse after its partnership with the British claymation house recently ended.
Head over there for more info about the movie plot.