It could be Ivy, that guy is just saying Catwoman 'fits' better in the Nolanverse. It could be Talia and Selina isn't even in it. This is going to be the final one though, so I can't see them setting up a future villian, ie having Selina as Selina and just teasing Catwoman.
I like the idea of Weisz in this, but I'd much prefer to see her playing a Villian to Craigs Bond.