Season 4 begins April 6th and will run for 10 episodes. Rumor has it that it will be picked up for 7 Seasons all together, so hopefully by then, George will have finished his books.
New Characters:
Prince Oberyn Martell, the Red Viper
Ellaria Sand--his paramour
Mace Tyrell--according to Olenna, the lord oaf of Highgarden, father to Margaery and Loras
Tycho Nestoris--representative of the Bank of Braavos--to whom the Iron Throne owes millions in borrowed gold.
Hisdahr zo Loraq--crosses paths with Dani in Meeren
Fat Walda Frey--new wife of Roose Bolton
Lady Anya Waynwood, Bronze Yohn Royce--vassals of House Arryn
Styr--lieutenant of Mance Ryder
3 eyed crow, child of the forest--mysterious characters from Bran's storyline
Roles recast:
Daario Naharis (dang, I like him)!
Tommen Baratheon
Ser Gregor Clegane
Absent for all of Season 3 but returning in Season 4:
Aliser Thorne
Lysa Arryn
Janos Slynt
Dontos Hollard
Rorge
Music:
post rock band Sigur Ros