Same here. It would be weird for them to announce Tom Hardy first and then announce him as the villian if he was only playing a side villain. I'm just crossing my fingers we get one more, and that it's not Talia.
I'm sensing that too, to follow along with what that one poster said, that each film has a Mob element, a main villain, a pawn (minor villain), and a protagonist to Bruce;
So, I feel that Maroni could once again fill the mob role, if alive. If not, I still feel Black Mask would fit perfect in furthering along the deconstruction the Joker put onto the mob in TDK. This would create the "new" mob which are run by FREAKS. Also, Band can try to steal the title of "Mob King of Gotham" like he did in part II of Knightfall.
Now, Bane is main villain through and through. I fell he will take out Batman, for good (to the city of Gotham) at the end of the first act. Here, the city falls apart at the hands of Bane and in walks Catwoman...
Here, the "pawn character", Catwoman will be mildly causing trouble early but doesn't take an impact until Batman is out of the picture. During said time, she could either destroy Batman's name through misdirection of a vigilante or the sheer notion of her and Bane's damage. Once, Bruce returns I feel her character will have some sort of a redemption with the Batman character and might even become his first "partner/ally" who is a costumed individual that can help him from time to time, like in the comics. This satisfies the Robin role without being cheesy or childish to the "Robin-Haterz" of the world.
Now, for a protagonist against Bruce we have may options. Selina Kyle could be messing with his business and to his heart. If Black Mask is slightly in the film, Roman could pose some problems to Bruce. And, overall Bane we will assume will deduce his identity and not only destroy Batman but Bruce Wayne's character/soul/motive/etc. as well...