Wow, I've been waiting ages. I'm going to buy it next year, but in the mean time, I will download it. I guess it's because it's just come out, but wow, there aren't very many places to download it. Hotfile (which is slow and crap), and Bitgamer are about the only two that have it. But I won't talk any more about that, because i don't want to get into the 'against the rules' side of things here. Anyway, I here a lot of the monsters have been added. I heard the name Kaijin; I guess that is the collective name for the monsters, but I'm not sure as I haven't watched all the Heisei series yet. It doesn't have any Showa riders (unfortunately), but there are apparently more unlockable characters, apparently a new mode or extension of an existing mode, and of course, fighting Dopants from Double is just plain awesome (especially when you get to beat up that creepy T-Rex Dopant. Man, she's weird).
Slightly off-topic: Nice to see Double get a game. Not his own though but oh well. Can't wait for those Figuarts to come in next year! Plus, I can't wait until I can get a Double Driver. If only it wasn't a toy.