It is not exactly a "leak" as Guy Oseary has posted every "leak" from YouTube almost instantly after Perez's releases. And Guy has requested to fans to "police" leaks. A reply to a fan:
"thank you... its more luck than anything else.. we are grateful that no leaks have occurred.."
More can be viewed here:
https://twitter.com/#!/guyoseary
I think this "leaking" is Guy's "non-traditional" promotion of the album of which is causing a buzz amongst the online communities. If you see on Twitter within "leaking" the previews most of the time the title of the song has trended worldwide. However Madonna NEEDS some "traditional" promo.
I ****ed Up is a great song and I am hopefull for the success of the album, but promo is ESSENTIAL. She is currently full-on tour mode so that is unlikely.