I want to develop a multiplayer fps game and while I wouldn't mind working in unreal, if standalone multiplayer is coming to GGM as they promised I would definitely prefer to start mapping and creating assets for the engine now.

It will be coming but not until they are happy with the SP experience which also includes VR as MP will support VR.
So its not going to be any time soon i doubt.

So about 5 years then.

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UNIRD12B

"I would definitely prefer to start mapping and creating assets for the engine now."

Hmmm.... for what?
Well, while you're at it- or in the mean time, start scripting, and keep requesting A> custom script in MP and B> objects spawned via script in any genre!
If you want to build a distributable (RE: commercial) multiplayer game, it's unique potential will be determined on either if they finally allow custom scripting - or if their non-script assignment system (what's it called?) has been really, really expanded to a much higher degree.
Also allowing above 8 players would really help also.
Or you could have a FPS / walking simulator multiplayer with doors and light switches. (maybe?) I guess those would be considered stock scripts?

s.u.p.e

I only just read this post, Amen you crack me up you have the dryest sense of humour, i just spilt my coffee laughing at that simple statetment.

It's so adorable that you think he was joking