In an interview one of the devs (Swen) mentioned that you can reskill your group after Act 1. It was connected to attribute points however. Wether the reskill is there and will also cover all the other aspects is not clear.
I sincerely hope that it will be possible to redeploy any point, attributes, abilities and talents.
I think we are in dire need of information about the reskill feature. In advance! It would greatly affect my choice of companion schools.