Levistus's_Leviathan
5e Freelancer
I don't think we're going to get many more classes in 5e. WotC has been pretty clear that if they have a new character option concept, it's going to be a subclass. Artificer is quite possibly the last new class we get in 5e.
I would want new classes, an official version of the Blood Hunter, a Psion, a Rune-Caster, Shaman, and Warlord. The problem with these is that if they ever come to 5e, WotC will probably shove them into other classes. Blood Hunter will be a Ranger, Psion a Sorcerer, Rune-Caster a Fighter or Sorcerer, Shaman a Druid, and Warlord a Fighter.
I would want new classes, an official version of the Blood Hunter, a Psion, a Rune-Caster, Shaman, and Warlord. The problem with these is that if they ever come to 5e, WotC will probably shove them into other classes. Blood Hunter will be a Ranger, Psion a Sorcerer, Rune-Caster a Fighter or Sorcerer, Shaman a Druid, and Warlord a Fighter.