I did some research...the Cruze will be based on the Delta II platform. The Delta (I) is the Cobalt and Saturn Ion. So basically it is a generation II Cobalt/Ion.

Interesting note...though many refer to the Cobalt as a new body Cavalier (J body platform) they share very few common parts other than engine/transmission. Even at that the Cavaliers used a speed/density fuel injection system and the Cobalts use a mass air system. Essentially its the same engine with a different computer controlling it all. Body, suspension, interior, etc are all different between the 2 vehicles.