I'm not as interested in Aya/Miki, but I'm hoping to see more of Momoka/Hajime, especially what the impact of Kyou's letter would be. I'd also like to see more flashbacks on Kyou and Momoka's relationship that show how each of them viewed it.
Incidentally, Volume 11 is out in English. One surprising thing that they changed was making Miki's ex a girl, rather than a boy, even though Volume 2 of the localization said that Miki's ex was a boy. It's possible that this is a mistake, such as when the localizers said that Momoka was Kyou's senpai(presumably based on her using "-chan" on Kyou).