Nothing, I guess. It all depends on what they offer him at Barcelona and how much he wants to play in this Barcelona-team.
If they say to him this month that he's not getting promotion an dthat there is no place in the first team for him, he's off obviously. And rightly so maybe, can you expect a talent like that to stay at segunda level?
If they say to him this month that there is no place for him now, but that they want him to play games with the segunda team for the second part of this season to gain playtime and he gets a place in the first team next year ... it's up to him what to do. He can still leave, as long as he doesn't sign something we are never sure.
It would be utter shit to not give him a place when you give Bojan an extension till 2015 in the same month.