I think the issue is going to come down to can they do it all in 10 hours. (Which I have a bone to pick with, why exactly, is HBO stuck with 10 episodes? Can they not just say 12 episodes, contracts can be tweaked likely easily enough, so why the bind?)
ASoS has an enormous amount of pivotal events within it, and I would hate to see anything cut from it so they can sausage-stuff the whole book into 10 hours, it should be at least 12, maybe up to 16... I hope that's not just my feeling about it.