I've pretty much given up hope of a power increase for this generation. Chevy has signaled that they are going away from the hp war with the camaro, with more of a focus on handling. I am waiting to either do a late '14 order or any info on a '15. I don't want to miss the zl1 because I have a feeling that the 6th generation will not be quite as powerful as this current camaro.
Edit: Keep an eye on the next cts-v. That could be a clue to what happens for the next zl1.
'02 CAMARO SS SOM; 5.7L LS1/FLS6B
'08 TBSS AWD Black Granite Metallic
'15 Malibu LTZ 2LZ Turbo
'14 CAMARO ZL1 Blue Ray Metallic