I don't see it being Rih or Kanye. Rih is way too competitive to release her album the way Bey did and fuel the comparison between them even more especially if it doesn't beat Bey's 3 day sales.
Kanye is way too egocentric to do that as well. He likes being hailed as innovative and the first to do things
If it's not Rihanna I'm going to smack a bitch but then I'll be cool because ANTI is set for 2017. It's either Bey or Kanye but omg I'm excited for whoever it is