I'm not quite sure if we can trust that RCA twitter account. Isn't that the same account that said My Kind Of Christmas sold over 6 million copies worldwide?
Let's not delude ourselves here. RCA won't release this on iTunes before it premiered on "The Voice". What they can do though is unveiling the single cover and send the song to radio beforehand, because that would be the cleverest thing to do. However, knowing that ****ty label, it won't be the case.
In a perfect world, this would be the schedule for the song:
next couple of days= single cover and radio premiere on Ryan Seacrest
September 6= First live performance of Your Body @ VMA's
September 10 = World premiere of Your Body on The Voice + Release on US iTunes
Mid September= Music Video Teaser + Radio promo worldwide + Release on iTunes Worldwide
End September = Music Video Premiere
October = Performance on The X Factor UK, several talk shows or the today show + Premiere of second single, which should be a ballad to promote the new album.
...