Uhm... I think I've said this before but in this thread I won't write in spoiler tags unless it's something that hasn't happened in this book yet so yeah...

Well they did split the book in two seasons and just gave us two major character deaths. I doubt the purple wedding will be in the next episode. Tywin and Ygritte's deaths definitely won't happen in the finale. That would just be impossible as Tyrion still has to be captured for a while after Joff's death and then there's the trial of course. That is just WAY too much for just on episode.

I do wonder what the cliffhanger will be. It might be the purple wedding, though I doubt that. I think that will happen in the S4 premiere. I also don't think the cliffhanger will be Lady Stoneheart... that's the very last thing to happen in this book and they split the book so yeah it would be too early.