I'm not so sure this is fake. I don't know why MTV would make up fake news about their own show, though stranger things have happened.
As much as I dislike MTV, they are obviously a popular TV station and source of pop culture news. The news of this line-up of LP, The Kooks, Scissor Sisters and Kelis is already starting to create some buzz on the internet.
I don't think it would look too good for MTV to put out fake news like that, they aren't some sketchy website. They're the real deal. But I guess we'll just have to wait until lp.com/LP twitter/LPU/Mike/someone confirms it from the LP camp.