This game promises You will have multiplayer online and pvp so far only certain things are known, but the above I think is safe.

I don't know if there will be trade for sure, but I think we can expect it. This game can surprise us all. It is an epic saga ...

I leave link below so you can see that today in the pax east of Boston they will stream the first gameplay of this game, you can watch time and where.

https://www.pcgamer.com/baldurs-gate-3-everything-we-know/

Not needed

if you get enough activity under this forum:

https://forums.d2jsp.org/forum.php?f=208

then yes.
If you don't then no.

simple.
Pendoria got it's own area pretty fast when it filled up like half of the other games area.

If can trade items, why no guys. Forum can be created...Dont know if will have trade for this game. Why this answer.