I would add martial arcane classes have been OVER acknowladged, but not in a unique way. Bards, ELdritch Knights, Arcane Tricksters, and even bladesinges are all useing OTHER spells. (most wizards) but they don't have any spells uniqe to them.
1 thing I would want is a 1/2 or 1/3 caster with weapon trianing and atleast a few spells just for them.
non spell useing complex classes would be nice (like your warlord example)
epic expansion (I don't mean over 20 but it could) just options for something in the last 5ish levels