Actually the one who made that clip is pretty smart. First of all, he didn't say it was Britney, instead he said it's a Demo because they usually are sung by anonymous people before they get delivered to the artist. Besides the "Danja" at the begining that he probably stole from some of his previous works. And finally, the video game sound. Too bad he missed the N*Sync part.
Anyways, I'm sure her first single is going to be hotter than ever.It will probably never leak before August. until that time ,we will be having tons of fake clips and information. Actually, I love that. As it makes me even more excited for her new sound. lol