In Japanese for the wubaduba part she says "Genki desu ka?" Which is like saying how are you. I'm not sure what "Otsumi tae" means but that's what the camera guys say. I'm just going to assume it means something similar to "Pose for the fans". It sounds better in Japanese because "Genki desu ka" is I guess easier to mix than whatever she could have said in English.
Oh and for the "Woah you go big guy" part she says "ne, sugoi desu ne" which is like "That's so cool" but I guess they couldn't come up with anything that had the right amount of syllables.
Yeah, it's not the same in English, but they did well enough considering. I'm just glad we're getting a new Rhythm Heaven game. I might even dust off my Wii for this!
I realise this might not be the final product, but the original soundtrack has a funny pitching effect on the interviewer's voice, making it sound similar to a DJ scratching. That's what makes it stick to your ears.