Davebaol (the d2x developer) stopped working on it since "it works". I don't know if he is still active nor will have any will to continue working on that project.
cIOS could benefit from few things (like better usb3.0 drive init, better emuNAND and Ustealth compatibility for alt version, merge main and alt branches back together if alt is stable again), but will require a competent developer.
For now, you can consider v10 and v10-alt as Final and stable, as much stable as v8 final was for Wii.