I think chemist is most likely out of those though probably renamed in order to create a starker contrast between it and the already existing Alchemist DoH job.

I know Yoshi P mentioned a Summoner rework so (while not super likely) I could see summoner be shifted away from their DoT playstyle to focus solely on the summoning aspect and a job like Necromancer or Time Mage being added to fulfill a DoT centric caster playstyle. Personally between the two I'd like to see Time Mage since they're more iconic and could have cool interaction with DoTs like increasing tick rates or pausing/extending timers and such. Necromancer would be a good fit too though since in FFV most their spells were about curses, debuffs, and dots with only a few where they summoned undead/demons.

Berserker is the least likely since warrior fills that niche. However It would be cool to have a heavy hitting melee DPS job. all the current are light, nimble jobs and all the jobs with huge 2h weapons are tanks. So having Berserker or Viking with a giant hammer (kind of like what gaia weilds) would be cool and the separate party roles would help create a level of distinction from warrior.

It is interesting to note that all three of those jobs, Berserker, Chemist, and Necromancer were first featured in FFV (ffv advance in the case of necromancer).