Same happened last year with Ashley Young, and I'm sure it will happen next year if we have a player that's wins young player of the year award.
Personally, I dont think he will go, not to Man City anyway. As they just buy players, and have no plan for what they want to do with them. I think it's it's Man U, then he woud go, because they will only buy a player they really want.
On the plus side, if he does go, at least with Man City interested it will push the price up.