Well we know in the Covette it's 505.
The hope, if there is any, is that Camaro intake and exhaust breath better than the Corvette.
But I also doubt GM would spend the money to go recertify it. Having an advertisable HP number is nearly meaningless simply by having the LS7.
The ZL1 needed a bigger number to compete wth the GT500 and as it turned out they were right to do so.
I'd be shocked if you saw more than the current certified 505 for the LS7.