I'm surely not the only one who was rather suprised, or in disbelief, when I read Juve had signed him. I would never for a second have considered him starter material for a club of Juventus' ambitions, and given the predominance of quantity over quality already there in their midfield, it seemed like a nonsensical transfer to make.
Now, I'm neither a scout, nor an avid Schalke watcher (it's enough I have to watch them twice a season vs us, really), nor do I have any solid knowledge about whether the loan will become a permanent transfer (I seem to remember reading a clause as easy as Juve qualifying for CL would trigger a sale). Good player, sure, but one great goal against a Barca in shambles isn't enough for me to change my opinion that he's nothing special and won't be good enough for Juve in the long run.