Nothings clear at the moment. But some fans are convinced the vocals are new, while others are sure they are from 1989. But I think most fans agree that it's not a Thriller out-take. It's just that all the Thriller out-takes are too unfinished to release. So they found probably the only good quality, finished out-take from MJ's whole collection that hasn't been released yet, and that was For All Time. They're disguising it was a Thriller out-take, but most MJ fans know it's actually from the Dangerous sessions.