I am a huge sucker for crossovers. Put in two or more of my favorite characters/shows/games together and usually I'm on it in a heartbeat even though it might be one of the worst thing man has ever created. Crossovers are one of my guilty pleasures.
Project x Zone is a crossover tactics game by Capcom, SEGA, Namco Bandai and Banpresto. From the looks of things the combat looks very similar to one of my favorite DS games which is Super Robot Wars OG Saga wherein attacks are done via simple buttons inputs but the fun is that attacks puts enemies into a juggle state and you have to time your buttons inputs to keep the combo going.
Aside from the awesome addicting combat, the roster of video game and anime characters here is ridiculous. I'd try to name them all but this is something that you just have to see. The sad truth about this game is that most likely due to licensing issues, this game will never be released outside of Japan. But how could anyone not want this game? I mean just look at Ryu and Ken's attacks at around the 6:30 mark.
There has been a rumor that Namco Bandai is considering to localize this in English depending on how well it performs in Japan. There's still hope!