I'm pretty sure there are a few new acts added on the main site:
https://www.greenman.net/line-up/2022/
Jesse Buckley - Bernard Butler (Confirmed)
Lone
Wunderhourse
There may be others.
With Anaïs Mitchell & Eric D. Johnson already announced, there must be a possibility of a Bonny Light Horseman set ? I'm pretty sure I read something to suggest BLH could be at Green Man this year, so maybe waiting on that announcement first.