Sony provided few details of the track, called This Is It, but several sources report that Michael's brothers are singing background vocals and it was produced by John McClane, one of the executors of the will.
But, after a few listens to this purported "new", you'll realize it's not so new.
Here's the "new" version.
This is the original, released back in 1991. Performed by Safire, the title back then was "I Never Heard".
And here's the 1985 Michael song "I Just Can’t Stop Loving You" which they sampled for the "new song."
This was sampled too. It's the 2001 charity song "What More Can I Give."