Regarding the inmediate future of Jump, what I want to see the most is the situation with the covers. Until issue 42 we won't be able to see that.
I mean, Kimetsu, Neverland and Haikyuu got many covers. We couldn't see anything of the new situation because breaks and we already knew MHA was getting the anniversary cover.
The situation is like that for the veteran manga:
-One Piece: It receives a lot of covers (since is the franchise manga of Jump)
-My Hero Academia: Surprisingly it doesn't receive many covers, just 2-3 per year (I assume the main reason is Horikoshi's health)
-Black Clover: Same situation as MHA, just 1-2 covers per year (Tabata health and Black Clover is less important than MHA)
-Dr.Stone: In 2018 and 2019 Dr.Stone was one of the manga with most covers. I think it was the manga with most covers in 2019 tied with Neverland (4 or 5 covers if I remember well). In 2020 it got overshadowed by the ended trio of Haikyuu/Neverland/Kimetsu in number of covers though. Dr.Stone has the advantage of writer + artist in this situation, and Boichi is a monster
-Jujutsu Kaisen: The big question for me. Unlike Neverland/Dr.Stone in their two first years, Jujutsu for some reason hasn't received many covers, just 2 per year. This 2020 it got its anniversary cover really late. I expect it getting a cover in issues 42-45 because anime, but still Jujutsu hasn't had the same promotion as other manga in the same situation.
-We Never Learn: Last cover: February 2019
-Chainsawman: Last cover: November 2019
Worst case scenario we are entering in a situation with 25 One Piece covers and 20 Dr.Stone covers in 2021 (I'm exagerating but still). The main questions for me are going to be:
-Will My Hero Academia have an increase of Jump covers?
-Will Jujutsu Kaisen finally going to be promoted in terms of Jump covers?
-Will any of the newbie (Mashle, UU, etc) start receiving covers?
-Will Yozakura Family get a 1st anniversary cover?
PD: Also, for 2021 we should be getting both One Piece chapter 1000 and volume 100 so expect tons of promotion in that sense.