Cameron comes in with 7 badges, thinking the league isn't over yet, and then realizes the league is over once he gets his 8th badge. Also brings only 2 Pokemon in a 3v3, but who cares he's got that Hydriegon and DEM Lucario.
What would be the point of Ash and Clemont facing again? It's probably just some random new trainer like that girl we saw at the end of BW.
There was a leak that said Serena, Bonnie, and Lillie would be the companions, but that's probably fake. Bonnie continuing on wouldn't be bad though. Her connection to Zygarde is certainly interesting.
When I first saw this title, I quickly assumed this was Clemont's departure episode - and I still stand by that since it seems the most likely. I mean what else could Clemont's decision be?
It's a fake - don't pay it any heed