I think they are moving the camaro toward a corvette style lineup.
I think in 2015 after the excitement of the Z28 has faded they will reveal an LS9 ZL1. This will put the ZL1 back as the king camaro and give sales another bump. The ZL1 will also increase in price though. There will probably be a Z28 convertible at some point though so I'm not sure how that will fit in.
2012 zl1 Black #1745 Black Wheels ECF Suede 6 spd