This is a pretty good deal if you want a generic DDR game for your Wii. Well, not totally generic: the Hottest Party games add in some gesturing you have to do with the Remote and Nunchuk that's actually pretty fun. Still, otherwise, a totally generic DDR title that just happens to have that Mii support feature the clue was referencing.
Amazon is offering Dance Dance Revolution Hottest Party 2, bundled with a dance mat, for $49.98. That's a significant discount from the usual $69.99 MSRP. I played Hottest Party 2 back at E3 and found it solidly satisfactory, if not really exciting at all. It's got more Konami and Bemani music in the mix than Hottest Party, where the soundtrack got really annoying in record speed.
There's only 20% claimed as of this writing, so you probably have a really good shot at getting hold of this deal if you want it. The clue for the seventh and final Lightning Deal is "You gotta get'cha, get'cha, get'cha, get'cha head in the game", so... something High School Musical, I guess. Oh boy!!