After the PS rebranding, for connecting international travel with one leg on PS service, does anyone definitively know the treatment of a GPU when just the transcontinental leg clears?

Pretty soon, United will rebrand PS business to BF, and the language in the upgrade rules (I think) suggests you will now burn the GPU even when you fly coach over the water. And how will it work if you use miles and money? Surely, United won't keep 30,000 miles plus $400-600 for just clearing the domestic leg.

Not sure if this should be asked in GPU forum or PS forum. Mod may move.

Thanks.