That is a very good question, I don't think anyone knows that yet.
My best guess would be that they will put together some kind of improved service for the whole Air Canada with such things as new seats in Business (maybe bring back first class for international flights)
I think they might get PTV's for the whole aircraft as well.
Any changes done in the cabins well start once the employee issues are solved, and everything is completly merged.
This is my opinion, and best guess