Like always, the multiplayer parts are missing in the docs. The MultiplayerShootout is a good step in this direction,
but i guess really simple examples would help more than a full project.
Also everything related to connecting things from outside would be helpful. Database, your own Dedicated Server and a
Master Server for having an online server list would be nice. Unity already has a a master server system up and ready.
Would love to see that in UE4!
EDIT: And Rama 
I really like your Wiki pages, but sometimes i feel like you are putting too much in a single example.
The multi-threading thing could be splitted into easy examples up to the one you posted. Not just the full thing in one
code. That is hard for beginners to filter.