I can confirm to you that it is 100% not Rihanna.
There is a bigger chance that it is Bey's lead single (which is already a massive stretch).
All in all it is 100% not Rihanna.
4 singles in over a year's time is pretty normal, though (which it has been since 45S dropped). There's been smaller gaps of time between Rih's new Nov eras than 45S & Work.
This pretty much feels like a new lead for new album.