I think they're going for a different strategy with the single/album release. Single is due out a couple weeks before the album.
I said this yesterday but it's likely to avoid overexposure. That's likely why she and her team haven't said anything yet and let HDD confirm it.
This was the same case in 21 and Rolling in the Deep iirc...althought a tad bit longer with 1 month apart. "Deep" was like released in the very end of November 2010 and the album was released on mid January 2011