Which brands will these FCW stars go to when or If they officially get called up(some NXT rookies)?

I don't think all will get called up. My picks to be called up would be Alex Riley (Smackdown, I would say), Brett DiBiase (RAW), Bo / Duke Rotundo (Smackdown), Eli Cottonwood (RAW), Joe Hennig (Smackdown), Percy Watson (Smackdown) and Kaval (RAW) and, since Rey Mysterio is heading towards an early retirement it would seem, Alberto Banderas (Smackdown)