There have been RUMORS (!!!) about a duet album. Teddy Riley said in an interview that it's one of the future MJ projects. Michael started to record many songs where he eg only sang one verse and the chorus, and then stopped, either because he wasn’t done writing the songs yet, or he simply rejected them. The plan is (or was) to get some of the biggest stars to sing the missing parts of the songs, to make it sound like duets with MJ.
RUMORS (!!!) say that Beyonce, Justin Bieber, Bristol Palin, Paris Hilton (close friend of MJ), and other stars will take part in the project.
Personally I have very mixed feelings about this. I don’t think it would’ve been in Michael's interest. He rejected those songs for a reason: he simply didn’t want to release them. They should respect that. I don’t like that they change his music, do whatever they want with it, without Michael's knowledge. He wanted his music to sound the same way as he wrote it, like it was on his records. Maybe he hadn’t even wanted to collaborate with some of the artists who are said to duet him.
Normally they should release something this year too!!
Due to the deal of $250 mil with MJ Estate, Sony will release 10 albums/projects until 2017.
So... I think and I hope that we'll have something this year too!!