I expect Sony will be a bit more conservative with the release of pro bodies: longer development cycles, more research, a refinement of technology introduced in the A7 line instead of introducing a lot of new technology potentially requiring v2 to fix it. I expect we will see, in addition to the 46 MPx sensor, more robust build quality, dual processors for increased speeds and (hopefully!) completely uncompressed 14 bit raw to the card, ibis, a larger or multiple batteries, higher frame rates, more refined focus tracking, etc.