Is there cross-platform multiplayer? if not is there plans to do cross-platform multiplayer?
I ask because I have a friend that will want to play this with me but he has the Xbox 1 only that would be able to do it(his computer is a mac). I have a decent gaming laptop but not an Xbox 1 so it would be nice to have the cross-platform multiplayer for the reason of people in situations like me and my friend currently.

Sadly i guess, that's not gonna happen, at least not anytime soon.

Here you can find some frequently asked questions including your one
https://forums.focus-home.com/topic/617/answering-frequently-asked-questions