HBO Game of Thrones Season Four Trailer: Vengeance

Payback is a mother...... or so some people say. Other people say that you set out for revenge you had better dig two graves. Still others were known to say that when winter comes and the cold winds blow the lone wolf dies but the pack, the pack survives. Robb and Catelyn Stark are dead and gone but the Stark wolfpack, while scattered and young, is a long way from destroyed. Is this the season of their vengeance? Time will tell. And what's Danerys up to? Is she going to get back to Westeros and take what is hers with fire and blood? We shall see. 
Enjoy clip below but as usual if you know what some of these scenes entail or book derived answers to the above questions, please keep them to yourself. Thanks! 

Season 4 Trailer 2