What if it's Kesha? She's been in the studio a lot lately and Nicki and Kesha are on good terms last time I knew, since they collaborated on the Britney remix. Nicki's also been working with Luke, so it's not too far of a stretch, especially with Kesha's new musical direction being more akin to how Nicki's described her album. Worth a thought.
I Can see 5 features, Rih (the female artist she mentioned) And then Cassie & Ciara, followed by someone she signed and then a Wayne collab. (As he gets on every single Young Money album :/ )