As far as Jaime's arc goes... with Catelyn and Robb dead, there's nowhere to send Sansa, maybe Jaime feels she's safer as Tyrion's wife, and Jaime's fallout with Tywin and Cersei may be caused by his willingness to send Sansa away (to Lysa Arryn, one would guess). I just hope he doesn't get sick from his wound again and spends the few episodes before the PW in a feverish state... :(