Btw I read some time ago this news . It basically says that in the lastest edition of Kagen no Tsuki a little message was written there: "2013 is the year where Ai Yazawa will start to move" (roughly, something along those lines, if someone can confirm it, would be awesome). So maybe she will come back at some point of this year? That would be so PERFECT (I just want she breaks my heart by finishing NANA. It will be broken, but at peace at last (?), haha).
Take care, good people.