Going through the book, the following are the minis I can see which aren't in harbinger. Mainly the actual minis are shown, alongside concept art. Sometimes it's just the concept art. The paint jobs look a lot better than the real thing (on the harbinger examples) so difficult to guess the quality on the future stuff:
- copper samurai (female samurai with bow and sword, running)
- halfling outrider (female, mounted on dog, with lance)
- purple dragon knight (male, greatsword)
- lion falcon monk (male)
- elf bladesinger (female, concept art only)
- cleric of nerull (male, large scythe)
- cleric of moradin (male dwarf, warhammer + shield)
- orc druid (male, giant club)
- drow wizard (male, staff)
- half elf sorceror (male, bladestaff)
- druid of obad-hai (male)
- bright naga (new monster - see below)
- black dragon
- stonechild (new monster - see below)
- eye of gruumsh (concept art only)
- large red dragon
- baaz draconian
- gold champion
- ogre ravager
- brass dragon
- large monstrous spider
- dire ape
- dire lion
- thayan knight (concept art only, female)
- red samurai (male, flaming katana)
- dwarven defender (concept art only, male, battleaxe + shield)
- carrion crawler
Which by my count is 27 or about half of the dragoneye expansion.