Policy is already out, but in a nutshell: a GPU is valid for E to J. If PP is available at the time of booking, you'll move there but still be waitlisted for J (waitlisted behind those who already had paid PP). One GPU is burned whichever cabin you end up in, but you're still eligible for J. If you don't think it's worth the GPU for PP, just make sure you switch back to E+ before departure.
Last edited by SteveHK; Jan 13, 2019 at 9:29 am