Was stated witin a Q&A.
A: Since almost the whole New World Dev-Team comes from the modding community, they said they would like to, but depends what Epic Games allows and what not.
A: See answer above
A: Maybe, no post-launch content is public yet
See the DoI DLC f.e
A: See above answer.
A: Ranked Matchmaking will come and depending on the community also leagues and stuff.