Here`s some recently leaked newish MJ stuff. Not great on the quality side, but the general consensus is “better than nothing”..

Agreed, on that one. At least we know whats “out there”:

Michael Jackson – Dirty Diana (26 DIY Multitracks)(Stream Rip Pack) Mega here Nitro here
Michael Jackson – Leave Me Alone (Multitrack) [Incomplete] (18 Tracks)(48k-24bit) flac Mega here Nitro here
Michael Jackson – Man In The Mirror [with Dry Vox] (Multitrack V2)(41 Mono Tracks)(48k-16bit) Mega here Nitro here
Michael Jackson – Speed Demon (20 DIY Multitracks)(Stream Rip Pack) Mega here Nitro here

Added to the main MJ Masterpost (Mega) here

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The Jackson 5 – The Life Of The Party (Multitrack)(16 Mono Tracks)(44.1k-24bit)
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Michael Jackson Multitrack Masterpost