"Permanent" and "indefinite" are two ways of saying the same thing, especially at WDW. "Indefinite" really just means there are no current plans to change anything, and that's Remy's status. (Saw him just a week ago, and he's delightful - I liked him even better because he doesn't talk, but squeaks.)
It would be very rare for Disney to describe something as "permanent", since that implies it will *NEVER* change, and this could be seen as painting them into a corner if they decided that a change was in order.