I don't understand the whole 'Get On Your Knees' thing. They could have released it with Katy because she's now free from anything (minus writing etc) but instead they put Ariana on it due to Katy being too busy for it, but now Ariana is about to start a new era? There's literally no hope for GOYK.
Anyway, Nicki is paying this song complete dust so it seems she's over the era.