Nobody knows Britney has released a song. She just put it out and left it to its own devices. She's literally posting pictures of Elvis eating breakfast on her Instagram instead of posting promo for the song. No music video, no word on upcoming performances, nothing.
"Rise" is just a buzz song for the Olympics. Wait till her actual lead single.
Rise is just bad. And the Witness demo that leaked is/was a step in the right direction for Katy.
As for Britney, other than her fans, people are just not checking for her musically anymore. And I echo the sentiments of a few posters who said they keep trying to pander to kids. They both need to move on with their sound. Rihanna has managed to do that with ANTI.