I don't see these being released anytime soon. The estate will want to release these on an album with the rest of the "newer" unreleased recordings. That would make the most money. I also wonder how many songs and are they actually finished???
So we're probably looking at an album right now of music produced by Will.I.Am, RedOne, and Michael himself. Maybe there are a few other producers we don't know about yet.
On a side note, RedOne recently produced a song for Usher called "More". I actually think that it's really good.