The driver reveals there are at least six Polaris 11 GPU and two Polaris 10 GPUs.
There are more Baffin (Polaris 11) graphics cards because Polaris 11 will be offered in both desktop and mobile segment. As for Ellesmere (Polaris 10), we can only see two cards, so these could just be R9 490X and R9 490.
Interestingly, the source code also contains a function for checking if the memory is GDDR5 so it seems AMD's upcoming graphics cards will be sticking to GDDR5 rather than adopt HBM2 or GDDR5X.
Via: VideoCardz