Rosberg has signed a contract for the next few seasons .
Hamilton , the last i heard was in talks about his contract .
I can't see them both remaining at Mercedes , beyond 2015 .
So , in all probabilty Hamilton will be on the move - but where to ?
Button has hinted that he might not be at Mclaren for much longer ( possibly retiring ) .
Is it inconceviable that Hamilton could make a return to Mclaren ?