If the writers stick to canon, then, using Anna Milton in episodes 4x09 and 4x10 as a guide, graceless!Cas should be able to do all of the following:
- Move objects with his mind
- See a demon’s true face
- Tune in to “Angel Radio” (assuming there will be anything to hear)
- Use the Angel Banishing Sigil
- Have sex with Dean
Onward to Season 9!
9x01 - We have confirmation of #3.
One down, four to go!