In two words: Dance Central.
This E3 was the year of cool devices: Kinect from MS, Move from Sony, and the 3DS from Nintendo, better known as The Guys Who Already Did Motion Control or This Year's E3 Winner.
Hardcore gamers who have been calling the shots from this year's E3 have looked at Kinect with a more-than-healthy dose of skepticism. Yes, developers will be tempted to crank out shovelware that involves jumping and full-body waggling. But relative to the Wii, there are two big advantages: computational horsepower and full-body motion.
The result of this is a huge coup for Microsoft in the form of Harmonix's next-gen mega-hit-to-be, Dance Central. This game will be huge with the college crowd, where dance crews are now so in. Talent shows have been replaced with dance contests on campuses nationwide. A game that exploits the fantasy of proficiency in something cool and creative (see: Guitar Hero / Rock Band) will always be a winner. A game that does this for a new field (hip-hop dance) will be a hit. A game that does all of this for whatever the college kids are doing right now and watching on MTV later tonight is going to sell 2 million copies overnight and 2 million more as it trickles on to significant others and little siblings. And unlike the rhythm games we've come to expect, it'll cost less than $100 for a group of 4 to play.
My preorder will be placed in short order. You're all invited to come dance on launch day.