Ok it's time to bring some life to this thread.
Let's get started with DDR X (Arcade version):
Coming sometime in the summer, and it will come with an expansion of the offering of the E-Amuse system (which lets you unlock content, secret songs, and compete with other DDRaholics from all over the world).
Also, Europe will get this one sometime in the fall with the Dance Dance Revolution X name (Konami finally cleared the legal issues for using the "Dance Dance Revolution" name in Europe, so no more "Dancing Stage").
Second order of business, What do you get when you combine The Nintendo Wii engine, game play, and music style from DDR Hottest Party, with classic songs from Disney, dancing characters like Mickey, Minnie, Pluto, Donald Duck, and some others? You get an updated version of "DDR Disney Mix" (which was on PSOne), and give it a new look and feel on "Dance Dance Revolution: Disney Grooves"!
[media]http://www.youtube.com/watch?v=DDbOT-wxnXU[/media]
And here's the full playlist for this game:
[media]http://www.youtube.com/watch?v=9EsMEVMPWu8[/media]