If there is this much hype, she is not going to wait a month to release it. I bet it goes to itunes tonight. Plus the lead single has got to get out now if they plan on releasing the album in the fall as it needs to be near the top when the album is released
They did the same thing with GG. By sending the single out tonight, it limits the 8th day fall out as we all know this song is going to get the iheart treatment of being played every hour. By letting radio play it tonight, the fall out will be minimal