This is interesting. He doesn't seem like an ideal fit for New Japan, but I'm hopeful that he'll do well. Juice is probably a good person to pair him with, because he wrestles more of an American style that Moxley would be used to. Plus if Moxley doesn't end up working that well in New Japan, at least you're not wasting an Okada or Naito or Ibushi or Tanahashi feud on him.
The video was very cool, although I don't get the point of the Union Jack unless it was literally just there to throw people off the scent. Which would be very lazy, so I hope there's more to it.
I have heard idle speculation that Moxley might be entered into the G1 this year, which would be very interesting. No better way to prove that you can wrestle after spending years sleep-walking your way through formulaic WWE matches. But it'd be a massive challenge for him. The standards are so high for the G1, and it has to be hell on the wrestlers to go through that many tough matches that close together.