who's gonna play the three sisters tanya kate and irina cause i'm seriously considerin tryin out 4 the part of kate

I don't think they have even casted them yet!!

The solid cast( bella, edwared, jacob, alice, jasper,emmett,carlisle,esme,charlie,seth,sam,paul,and everyone else from the former twilight movies) haven't even gotten the script yet. I'm not sure if they cast those parts yet though. Good luck with your auditon.