Well, Zero has a vita remake and Ao is getting one early next year, so hopefully the newly formed Sony localization team will pick them up for the vita (or at least test the waters with Zero). The only problem is the last game in the first trilogy . It doesn't seem likely that Xseed will pick it up after the second game.
I do hope some good games come to the west for the vita out of the Sony team and not just noise ^^.