Michael Jackson returned to studio in 2003 to rework songs that did not make the ‘Invincible’ album.
These songs were mostly songs that he had already worked with Rodney Jerkins during the ‘Invincible’ sessions.
For that reason, he called Rodney Jerkins again who immediately accepted to work with Michael Jackson for one more time for a brand new studio album (although Rodney Jerkins was also busy working on other artists’ albums at that time).
This should not be confused with the fake ‘Resurrection’ album project which was just a result of an idea that some dissatisfied fans (with the whole ‘Invincible’ sad situation) came up with.
Also, in 2007 (February), Raymone Bain (who was his official representative at the time) confirmed that the main reason for Michael Jackson's temporary residence in Las Vegas was that he found it a convenient location to record with the artists, songwriters, and producers who were working with him the studio.
Few months later (June), a brand new studio album was almost complete, as Raymone Bain confirmed by saying that Michael Jackson was putting finishing touches on it.
In 2008 (May), American producer Ne-Yo revealed that he was submitting songs to Michael Jackson for a new studio album.
Ne-Yo stated also that this was going to be a very important album for Michael Jackson.
The following month (June), Ne-Yo became more specific and said that he was submitting songs as MP3s via email to Michael Jackson.
Michael Jackson after hearing these submitted songs (and after demanding slight changes to some of them) he found them perfect and he continued to request even more songs from Ne-Yo for a new album.
That recorded material (coming from Ne-Yo) also still exists and it consists of nearly completed songs with Michael Jackson’s vocals on many of them.
In short, there was not only a planned studio album (after ‘Invincible’
, but also there is still a lot of nearly completed unheard material from those years.