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I work in the production company that makes Smash (My uncle Yoshi Smash is the CEO as well).
As I can't keep the secret in any longer I'm going to tell you all about the bit we filmed with Masuda.
After a huge build up in the last 5 minutes of the show Masuda goes into detail about Mewtwos new forme and how this can be obtained in pokemon XY. While this is all happening people dressed in pokemon fur suits are dancing around provocatively. He also says that XY are named after the spacial co-ordinate axes you get on 2D charts and there will be a pokemon Z coming out as the 3rd game, not a sequel like black and white 2.
Disco music starts to play while the guys in the fur suits start to gyrate.
Masuda then says that the new region is inspired by France not Britain and he was just trolling you by putting Blackpool tower in the trailer. Also that Sylveon's type is not the new type silk, which would have made sense given the silk ribbons, but is in fact fairy.
The Music intensifies and as the Village People's "Macho Man" rings out and the guys in pokemon fur suits start to dry hump each other Masuda says they will now reveal the new rival for the first time.
Out walks Mirror B
And then the credits run.