If those rumors were truth, then I would be 100% sure the 2 collabs are Wiz khalifa and Beyonce.
1. Its confirmed and a fact that Miley's collab is for Miley's album, don't think there will be a second / double collab for Brit's album, for the way Sean speaked, Britney just did it like for doing a favor to her.
2. Rihanna and Britney already collaborated recently, unfortunately in this business, is really weird to see artists collaborating for a second time specially in short time, at least they're friends, and I'm sure Rih and Brit are not friends, probably they haven't talked since the Billboard performance, Rihanna also seems busy touring and partying,
On the other hand, Wiz has been rumored since the very beginning, and Beyonce rumors sudenly started.
