I think an off season move more likely with Green. Let him finish out the season with Rondo and improve his stock. It obviously depends on the deal, but I would imagine Green is probably under-valued now on the trade market given his role/performance the first half of the season.
If it is true that Green can be better integrated into the offense under Rondo, and therefore make better use of his efficiencies (note: how often he got to the line against the Magic, finally!) he will be easier/ better to move in the offseason. Or, perhaps, he will show that he can be a more consistent scorer and we'll decide to keep him.