SiNG is just a working title at this point, but the upcoming Wii U game is trying to be the ultimate karaoke party game. And although my experience with the demo was unfortunately limited, I can see that it could be a lot of fun with a big group of friends. Especially slightly (or moderately-to-seriously) intoxicated friends!
The gimmick with SiNG is that they want to get everyone involved, not just the two people with microphones. There is a "sing" mode where one or two people can sing a song from the playlist to have their performance rated as they try to sing it accurately. Unfortunately, I wasn't able to demo that because their microphone was busted, so I can't speak to how well it plays as a karaoke game, if it's seriously picky like SingStar or easygoing like Lips.
But what I can tell you is that the party mode is where the real fun is going to be at. This is their main focus with the marketing push, too, because it's where SiNG stands out from other karaoke games. The lead singer holds the Wii U GamePad and microphone, and can actually face the audience instead of the TV because they're reading the lyrics right off the GamePad touch screen. Meanwhile, everyone else watches the TV where a character demonstrates the simple dance moves you can do with the song and then throws up the lyrics to the chorus so everyone can join in with the backing vocals. The song we demoed was the ubiquitous "Call Me Maybe," and as overplayed as it's getting by this point, it's the perfect mindless pop song that gets everyone up and singing and dancing along. We had an entire room full of Nintendo reps and journalists all bopping around and belting out the chorus looking like idiots.
There's no song list at this point, which is for me, where a music game lives or dies. However, now that Nintendo has embraced the DLC concept, I would imagine that SiNG would be the perfect game to keep alive through regular releases. But even with just my brief taste, I can see how their concept of getting everyone to play along even if nobody is actually being scored on their singing or dancing could be a lot of fun.