Regarding the Yara Greyjoy angle...I have a feeling Victarion Greyjoy may be chopped from the series and that Yara will assume the amalgamated role of Victarion and Asha. Unfortunate since I thuroughly dig Uncle Vic, but adapting this book series for television will have to begin to diverge in major ways at SOME point. Groundless speculation obviously, but it seems trivial and goofy to only rename a character if you haven't also done something "else" to them. Taken alongside no casting for Victarion for season 2...
Jon witnessing Craster offering his newborn son to the white walkers was also a bit of a divergence. If memory serves, the books handled it as a bit of dialogue between Sam and Gilly. So it'll be interesting to see how things advance in the TV version. Perhaps the giant cluster-fudge at Craster's cabin that occurs in Book 3 will be stepped up considerably? Perhaps the Fist of the First Men battle will take place at Craster's compound instead?