Seems Age of X created a bunch of "anomalies." Chamber is repowered and missing his face again. Angel Salvatore is repowered. Rachel appears to be back on the island (if that is who Revenant is; she's wearing that old Phoenix costume Rachel used to wear).
Callisto may be repowered and without tentacles.
Others we don't know yet exist.
Plus the psychological effects. Emma-Scott-Cargill triangle? Storm-Namor?
Where did you see Angel and Callisto were powered?
I'm still not convinced Revenant isn't Jean, especially since they made a pretty big deal (well, somewhat?) to remove Rachel's phonenixy powers not that long ago just before second coming. If not Jean, then the phoenix force itself appearing as Jean. In the second or so issue of AoX, she mentioned she was on her way home, but got lost. I read that as Jean-Phoenix preparing to return, but it could also apply to Rachel.
That said, it was odd that Scott didn't react either way (Jean or Rachel) to the fact that she was there.