@ProG1987 From what I have heard, yes it is coming, but not sure when. They had said 2022 last year, but with the year winding down, I don't see it coming this year, personally.
Also, from what I've heard, they will NOT be implementing account merging. It sounds like you'll eventually be able to progress your level across platforms, but your cosmetics will remain exclusive to the account you unlocked them on. (I could be remembering incorrectly, but I'm pretty sure that's what I've heard)
That being said, all of your stuff will always be there on your Xbox account. You just won't be able to access them on you PC account, and for the time being, the two accounts will progress separately. Even once they implement cross-progression though, it sounds like you'll still be starting from scratch on PC, when it comes to cosmetics/heirlooms and whatnot.