I wouldn't expect brett to reach terminal gravity in a couple months on 1.012 in most beers. WLP568 is known for stalling early for no apparent reason (and not just winding down very slowly like WY3724) so you may have a lot of otherwise fermentable sugars that brett can chew up quickly.
Check where the gravity is in a couple months. Check a week apart to see if there is continued fermentation and how quickly it is proceeding. If it is in the low single digits then you are probably alright to bottle normally but anything higher should either go into thick bottles or should get bottled with an adjusted volume of priming sugar and allowed to age in bottles until it has reached a terminal gravity and carbonated.