None of them in the OP seem official now cause some person at the Pokemon Game Show brought an audio recording device with them and recorded the battle and other music played during the demo. These are probably official.
It's also being said that older Pokemon are getting updated cries too. You can hear Crobat's and Mewtwo's in the Trainer Battle one (or first one) and Pikachu's cry being replace by it's anime voice in the Wild Battle one (or third one). Though it's said that Pikachu having it's anime was just used for promotional reasons at the Game Show so it could just be a remastered version in the actual game like Crobat's and Mewtwos are.
I'm glad they're updating the cries (And may be the only one). Yeah I'll miss hearing the old ones, but it's overdue. It never made since to me why they still had old 8-bit cries in the newer games when they had technology to revamp and remaster them. I can appreciate them taking advantage of the technology available on the 3DS. Hopefully they make different cries for some of the Pokemon that had similar cries cause it would give each Pokemon a different personality and not all sound the same.
Now on the actual music, I really like it. Skiddo riding one is my favorite so farcause of how fun and dancey it is. The rival themes are cool too and so is the Wild Battle Theme. The Congratulations on Evolving Theme and Trainer Victory theme are similar to past ones, but that was expected cause it's always been similar. I hope the Gym Leaders get their own music again like in Black 2 and White 2 cause that made the Gym Leaders have much more personality.