Well, the 3-4-3 is a somewhat odd formation, but he seems a bit less scared to field a more attacking line up? What does he usually use when the 3-4-3 didn't work? As he won't have been able to use that everywhere he went.
The most obvious.
Buffon
Caceres Cannavaro Chiellini
Candreva Melo Momo Giovinco/De Ceglie
Diego
Amauri Del Piero
I know one thing, his tactics are pretty good for big target men. His Milan won the Scudetto and Oliver Bierhoff took the Capocannoniere. I think all his goals were headers, half of them were crosses from Thomas Helveg.
He's always used 3-4-3 or 3-4-1-2 anywhere he goes. The problems is that the 3-4-3 he uses is more like 5-2-3 on actual practice. So yes, he's not that offensive minded as far as I can remember.
So, I have my doubt about seeing the likes of Candreva, Seba, etc. playing as wide midfielders under him as a coach. More likely we're going to see Caceres, Brazzo, Grosso, PDC there. I remember Helveg is more of a offensive minded wingback, no? Similar to Grosso.
So, if he's choose to stick with his favourite formation, here's probably going to be,
Buffon
Legrottaglie Cannavaro Chiellini
Caceres Melo Momo Grosso/De Ceglie
Diego Amauri Del Piero
or,
Buffon
Legrottaglie Cannavaro Chiellini
Caceres Melo Momo Grosso/De Ceglie
Diego
Amauri Del Piero