Will the next-gen GTO and Monaro be built on Zeta?

The Pontiac GTO and Holden Monaro are going away, with the future of both models being somewhat unknown. Speaking in Australia, Bob Lutz says that "it's in the process of being figured out" whether either vehicle will be built on the upcoming Zeta platform, which many assumed would be the case. At this point, it's difficult to figure out any of GM's RWD plans, so don't be surprised if the story changes a few more times before anything becomes definite. [PDF warning for the link below; the info I speak of is on page 10]