Since both the imaging and now possibly the camera companies remain wholly owned by Sony, the parent corporation - I would think that little on the surface would change. Peeling back the covers, it really depends on the past and current policies between the two. What I mean by this is that the camera business might have received a break on price of the sensors and then some profit allocated back to the imaging business. Now, with a more clear P&L opportunity, there is little incentive for the imaging business to do anything for the overall good of the corporation.
This also might show up in the rumored 6 month lead time the camera business had in terms of getting access to new sensors before other third party manufacturers. This might speed up release of cameras with the newest sensors by everyone.
You also need to ask, if the camera business received any breaks on having the very low light sensor developed - the one in the A7R. Did cameras pressure sensors to provide this part. It is interesting that no other third party manufacturers has followed up with a body using this part. We will probably see the camera business not be so willingly to experiment with new approaches like this.
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