Im actually expecting a fake out. If Jim Lee weren't in a position of power at DC (and from all evidence, a really nice guy) I'd suspect we're getting a return of the classic costume. This is Johns after all, and "classic" is what he does. However, I dont see DC making any major changes to the Lee design while he's still working there. At least not now.
So, a few minor tweaks (I'd welcome a change to the boots and belt!) maybe, but Im expecting a "new" suit like what Supergirl wore last issue. Clark will discover some new, dues ex machina function of his uniform, it'll be used in one scene and/or battle, and then it'll never be heard from again.