Yes, the rumors are true.
Yes, it's going to be permanent.
Spoiler-tastic article here: family-room.ew.com/2013/01/29/…
Do NOT click that link if you wish to avoid season finale spoilers. Also, I'd recommend avoiding the comments section, which will inevitably explode over this.
Commence tinfoil hats!
DJRD, Secretary of Princess Luna
Luna Nos Custodit
even tho her personality isn't going to change