What do we have that’s still lingering?
Orc Druids have a single precedent character and the osmosis argument.
Highmountain Warlocks make just as much - if not a little more - sense as the existing Orc Walocks.
Night Elf Paladins are a no-brainer if you played the class during Legion.
Anything else that has been hinted at or otherwise has support in existing lore?
Tinker class.
Gnome and Goblin Hunters wouldn’t be new combinations. 
Gnome Shamans
Nelf Paladins
KT Paladins
Dwarf Druids
Worgen Monks
Tauren Mage
Tauren Rogue
Zandalari Warlock
Goblin Monk
Undead Shamans
Panda Druid
Vulpera druid, paladin, and demon hunter. All three make perfect sense. Perfect sense being they’d be adorable.
Mechagnome shaman and druid.
Kt paladin.
Orc and Draenei Demon Hunters, too. They were also Illidari.
Blood elf druid
Not entirely correct. Ill give you a gold star for night elf paladin though.
I’ll maintain a retribution pally the second they make this possible.
Howso? I get that it’s a combination people want. But one that’s supported?
Hooved rogues (both sides) and more druids overall!
Vuplera Druid!
Lightforged Draenei Shaman!
I’d like to see:
1.) Draenei - Demon Hunter, Rogue
2.) Night Elf - Paladin
3.) Tauren - Mage, Warlock,
4.) Undead - Paladin
5.) Orc - Demon Hunter
6.) Blood Elf - Druid
7.) Worgen - Monk, Paladin
I can go on forever about this stuff!
Agreed. If Orcs can be Rogues, anyone can. Particularly when we now have a Pirate-specific spec and Tauren have been pirates since classic.
But Vulpera Druids? Lightforged Shaman? Tauren Warlocks? Blood Elf Druids? I’m unaware of precedent for these, though I’d love to be enlightened.
Gnome shaman - if Goblins can have the class for “mercantile” reasons we certainly could for scientific ones.
Gnome pallies - warriors + priests + close association with dorfs is a good reason.
Mechagnome Druids - because transformer robot Gnomes would be flipping’ awesome.
Gnome Demon Hunters - because Gnomest.
I don’t disagree that transformers would be cool… but do we have any existing examples?
It’d be even cooler if like 5 of them could latch onto each other as a combiner and tank like a big brute lol.
Pandaren & Vulpera Druid
Draenei Rogue
Worgen, Goblin, & Lightforged Monk
Worgen Shaman
Zandalari Warlock
VE and Nightborne DH
I mean, none of those exist yet, but precedent?