Hard to say if it'll be this season, a lot has to happen for her death to make sense plot wise-- but she's surely a lock to catch it before the show wraps, Jaime is up there too.

As for the show as a whole: My guess is that whatever we get will be top tier television, but this opener has me a bit worried. There's a lot of short cuts in the writing and things just feel rushed. Arya did her dirt, and then in the same episode we got a forced line between Cersei and Jaime (I think it was literally "...that thing with the Frayes.") to let us know that they know. GoT almost never did this before, having exposition in dialog when all characters present are already in the know, and when it did happen, it wasn't so jarring and sloppy.