Mr. Bad Guy was released in 1985, but the version of the song included in the album was not the version Freddie recorded with Jackson.
Jackson and Freddie recorded the song as a duet, as well as two other songs – State of Shock, and Victory.
After Jackson’s death on June 25, 2009, due to a cardiac arrest, Brian May and the remaining members of Queen worked with Jackson’s estate to release these songs.
The band’s original plan was to release Jackson and Freddie’s duet in 2012 on the compilation album Queen Forever.
However May found himself struggling to work with the Jackson estate, and couldn’t get the song released until two years later, in 2014 – 33 years after it was originally recorded.
source: express.co.uk