By Npc’s, do you mean, just quest givers, or does that include enemys?
I mean quest givers because enemys need many additional things like an AI.
And will quest’s and the such be available?
Work is in progress. It will come over time.
Also, are the pickups, like the flags and the collectable bricks, implemented yet?
No. In the unreleased version items can be given to a player, although not over smashing/collecting bricks-
I would also reccomend (WAY down the road) adding a place to add server IP’s.
Actually, there were two public servers avalible about a month ago. But because of the lack of doing anything they were closed until you can do more.

I hope you got the answers and know more about what is going on.