I'm also, like many others, very curious to how it sounds on the new mix, yet, as OnirMJ already mentioned (and everyone simply knows, this song, along with the vocals, is by far the weakest song on the album. Doesn't matter what they did with it, as I fully believe they made it into something enjoyable, it's 'not' a good idea to release it as the lead single to represent the whole album.
Why the 'not'?
As many mentioned the disco sound is returning, maybe they will get lucky with that (not a pun on the song), but how would this represent an album that has 1: Much older sounding vocals from MJ (90's and 2000's) and why again a track from the Thriller era? I really won't believe anyone who is convinced that the vocals from LNFSG are better than, for example, APWNN or STTR. And to the ones agreeing with STTR being a 'boring' song compared to LNFSG because a lot is repeated, did you actually listen to LNFSG? The whole song is just repeating itself over and over again. And 2: As Pentum and others also mentioned, LNFSG was NOT an outtake. I simply do not believe MJ ever wanted to release this track on something else or do something with it. It's incredibly old, dated and an obvious demo (regardless of that, a fun song still).
Overall, fun and enjoyable song so don't think I'm being 'negative' here, because God forbid I say something bad, but seriously, with all the strong offerings we have on the album and with STTR and Xscape already having been introduced and hyping up the album, how would releasing LNFSG, a Thriller era track with obvious young vocals compared to the rest, be a good idea to represent it as a whole? People might think the whole album has songs like that (if they really like it) and come to the conclusion the other songs are incredibly different (which they are).