If i had to guess season 4's ending would beJoffrey's wedding feast, with the very final scene teasing Lady Stoneheart(using this name as to not spoil anyone silly enough to read this that hasn't read book 3 yet... ) I doubt it would end on Jon escaping unless they planned on saving the Battle at the wall to season 5, but that would take away any major action from the season... would certainly make Season 5 a bit more exciting though i guess if its mostly books 4/5 stuff.
Big Spoils...
Doing Joffrey's death makes much more sense at the end of S3.
I think the TV show will play up Mel's 3 Kings prophecy quite a bit too and killing Rob, Balon and Joffrey in the same season makes a ton of sense. As opposed to killing 2, then saving 1 for Season 4.
My predictions
Ep8 - Red Wedding
Ep9 - RW Fallout
Ep10 - Purple Wedding
It's important to remember too that moving up or back certain story arcs most of the time doesn't interfere with other ones. Bran, Dany and Jon's arcs can really end where ever they want and don't need to be aligned to where the Red/Purple Weddings happen. So you're only really moving up the events of Kings Landing when you think about it.
Moving up Robb and Cat's arc doesn't matter really, since their arc is basically over after Red Wedding anyway.
I also think they will move up Lady Stoneheart's reveal to S3 also. In fact, at this point I would bet large sums of money on the final two scenes of S3 being Joffrey croaking with the final scene being Lady Stoneheart's reveal. It would keep consistency with the TV series making the final scene a big "magic oriented" scene too.
S1 - Dragons
S2 - White Walkers
S3 - Fire Priest Zombies
I think the TV show will play up Mel's 3 Kings prophecy quite a bit too and killing Rob, Balon and Joffrey in the same season makes a ton of sense. As opposed to killing 2, then saving 1 for Season 4.
My predictions
Ep8 - Red Wedding
Ep9 - RW Fallout
Ep10 - Purple Wedding
It's important to remember too that moving up or back certain story arcs most of the time doesn't interfere with other ones. Bran, Dany and Jon's arcs can really end where ever they want and don't need to be aligned to where the Red/Purple Weddings happen. So you're only really moving up the events of Kings Landing when you think about it.
Moving up Robb and Cat's arc doesn't matter really, since their arc is basically over after Red Wedding anyway.
I also think they will move up Lady Stoneheart's reveal to S3 also. In fact, at this point I would bet large sums of money on the final two scenes of S3 being Joffrey croaking with the final scene being Lady Stoneheart's reveal. It would keep consistency with the TV series making the final scene a big "magic oriented" scene too.
S1 - Dragons
S2 - White Walkers
S3 - Fire Priest Zombies