Nobody knows when it is dropping. Soundfiends said it is Rihanna. She is having a press conference this week at the Hard Rock Cafe. So it is assumed to be her.
Every articles makes it sound like whatever is coming this week is an album. Some people think it is a single. At this point all there is speculation, but Soundfiends has never been wrong before.
It is possible that it's Rihanna because she does have two releases coming this year, if I'm correct. She has that soundtrack thing and she has her eighth studio album, right? So, it is possible she's releasing something tonight.