Haven't seem him too often 4 or 5 times this season, but from what I have seen, he's an energetic runner/b2b midfielder, sometimes aggresive and a decent solid passer.
I would say a poor mans Marchisio is the best way to describe him.
a pre-agreement? like when we sold Diego to Wolfsburg to have the first option on Dzeko :D
If we want Jovetic, we'll need to sign him this transfer window, if he pulls off another season the likes of Chelsea and City will be all over him.