Epic have launched a cross-platform (Unity, Unreal et al) set of multiplayer services including lobby / room creation, matchmaking, peer to peer mp (good for coop) with NAT traversal, leaderboards
Looks like Epic are continuing to put their Fortnite money where their mouth is. It would be great to see an addition to the Unreal Multiplayer course 
There has been lots of momentus news! We will be watching to see how this one develops. The integration with this should be smoother than with steam.
Hey Sam I just signed up with your Unreal Mulitplayer Master: Online Game Development course. I really hope we can integrate what is learned here with this new SDK. I would love to see a Bonus video added at some point. I’m about to start so looking forward to your class!
Well right now there’s just an SDK. I remember reading that it’ll have integration with Unreal and Unity at a later point.
So right now you have to set it all up manually yourself. So I think it would make sense to do that once it’s integrated into to the engine/editor.