The only big consepts missing is the "forest" from 3rd edition and Time scape. Thing like the master thief and arch mage titles in the previous city expantions seem to be gone but will most likely not return.
Of the unreleased characters you have:
FFG seem to avoid the other culture characters found in 2nd edition, so I don´t expect to see:
The rest are:
Hobgoblin: Don´t think hobgoblins are modern enough to be included.
Inquisitor: Perhaps not political correct enough.
Warrior of chaos: Too Games Workshop but I guess the Dark cultist are the replacement.
Dragon Slayer: Too GW but replaced by the dragon hunter.
Dark elf: Too GW
Then there are the 3rd edition characters:
Witch elf: Too GW
Goblin fanatic: Too GW
Skaven: Too GW
Beastman: Too GW
Chaos Dwarf: Too GW
Astronomer: Was really a replacement for the prophetess so it is really included.
So there are many that will not be released, and some may have returned under new names. I only feel that the forest themed are characters that would fit the setting.