Everyone knows the whole "save the best for last" saying.
There's a reason for it.
My prediction is that the Zed WILL return, simply cause it's always been the most coveted of the Camaro lineup. I however think that it won't be as unique as the ZL1, but rather relieve the ZL1's ride components, with a tuned LS3. It was always said after all that the LS3 has potential beyond the 426 horses that the SS currently produces. I think that doing a mash of the two models would be effective, financially, and do the job that would bring the Z28 back to it's right name.
Oh, and they should also built it as a manual tranny only!