Just saw these excellent articles designed to catch viewers back up on the various characters and where they stand heading into season 4 that starts April 6:
Characters in King's Landing:
http://www.thewire.com/entertainment...dition/359257/
Characters in the North:
http://www.thewire.com/entertainment...-north/359296/
Sounds like they will also be doing one for the Wall and beyond to cover Jon and Dany and others around them as well.