Big events in GoTs Season 4 ***Spoilers***

Ok I'm going to just copy and past what ffishstik put cause it was too good.

There is actually a LOT of material left from ASOS that they didn't get to in Season 3:

Introduction of the Martell's and the Red Viper
The Purple Wedding
The Thenn's attack on the Wall (you know nothing Jon Snow)
Sansa's escape with Littlefinger
Lysa's flight from the Moon Door
Balon's flight from the bridge
Cat being pulled from the River / UnCat
Jon becoming Lord Commander of the Wall
Tyrion's trial and the death of the Red Viper and Clegane (yes, I know Clegane comes back)
Tyrion's escape with Varys
Tywin not shitting gold
Shae and the hands of gold
Arya at the Inn (is there gold hidden in the village?)
The death of the Hound (yes, I know he's digging a grave later)
Arya leaving for Braavos
The second attack on the wall (the REAL one with Mance)
Stannis saves the day!
Val, the sexiest thing north of the Wall
Widow's Wail and Oath Keeper
Jaime becoming Lord Commander of the King's Guard
The sewers of Mereen
Jorah, the spy who loved me

I was thinking that the first half of season 4 would cover the rest of ASOS, but now I'm not so sure. There's a whole season worth of material there.