It is currently a transition period for GM around what they build.
When the dust settles, GM will produce Buick, Chevrolet, GMC, and Cadillac.
Pontiac was part of GM, but they will no longer be in existence when the last 2010 Pontiac Vibe is produced.
Saturn has been sold to Penske.
GM is still looking for a buyer for Saab and Hummer.
A Dodge Caravan is not a GM product. It is made by Dodge, which is a subsidiary of Chrysler.