Re: Paul Giamatti IS Rhino
He's been "confirmed" the same way as shaliene and jamie were prior to their official sony confirmation.
With those two it took a decent amount of time for the official seal of casting approval to be made; now giamatti is in the same boat.
so no, it is not official that he is the rhino but it is extremely likely.
ps. it was the hollywood reporter who said he was in talks. from what i hear there is no reason to doubt them.