The game's finally out now, anyone else get it?
The core gameplay is off IMO. Instead of tapping, you need to slide the stylus into the numbers at the right time. It works, but it just doesn't feel as good as tapping. I suppose it could just be because I'm so used to EBA/Ouendan though. I would rather be tapping the beats though, and it seems to me as if the only reason it was changed was so the game couldn't be called a 100% copy of Ouendan.
On the other hand, this is still a fairly fun rhythm game. And unlike EBA/Ouendan, I can't imagine anyone having complaints about the music on this one. It's kind of hard to argue with a music game that gives you Mars, the Bringer of War and Ride of the Valkyries. And the game definitely is challenging. I haven't tried anything past easy yet, but even though I'm finishing the songs, I'm pretty much getting all C's so far.
Overall, it seems to be a decent rhythm game. Just don't go in expecting EBA or Ouendan, because it's not as amazing as those. The $20 price point definitely helps here as well.