When Midway went under, several companies bought up rights to the publisher's historied franchises. Electronic Arts got Blitz and NBA Jam, but Warner Bros also picked up a handful of properties from the bankrupted WB Games.
Rampage was among those properties, despite the fact that there's been nothing new from the series since Rampage: Total Destruction for Wii way back in 2006. Graphic Artist Andrew Baker's website has a piece of concept art that suggests the franchise might have something in the works.
This Rampage reboot was apparently in development as a Kinect title, but given the state of turnover in Midway work, it's only described as an unreleased prototype. Maybe the motion controls just didn't work....