Peacekeeper_b said:
From the preview that was out (Sister Hospitaller) I believe that is exactly how it works. They are rank 1 alternate ranks with the starting skills, talents and equipment also changing, but rank 2+ revert to normal.
Not exactly.
They can become Repentia, for example.
Also they never can become psyker, nor sorcerer, even if Adepts normally can. 
