I'd love us to use a winger formation, but there are just so many things that cross into that way. Like Tevez/Llorente and how we'd need to buy MANY wingers in order to make that happen, simply because in the summer we'll have only Giovinco who's viable on that position.
It just makes me think of 4-3-1-2. I was never a fan of that formation, but I think it would work in this Juve. If we manage to sign a (great) player who'd link our midfield with Llorente and Tevez, I think that would be kick ass. We'd be very capable of defending and making that formation work would require only one big signing. Player like Menez would be bench option as he can cover many positions, but most importantly both AMC and SS. Asamoah is capable of playing a LB (it's a pity not to use him as a MC, though) and with an offensive (and effective) AMC I think we'd be fine with him there.