Here are just some of the units I intend to make in the future:

Skaven:
Stormfiends
Master Assassin
Eshin Sorceror
Chimaerat
Burrowing Behemoth
Warp-copters
Goblin-Slaves of Clan Rictus

Lizardmen:
Coatl
Quango

Wood Elves:
Falconers
Spites
Wain Lords
Revenants
Lost Knights

Beastmen:
Brays
Bovigors
Turnskins
Giant Razorgors of Mammoth size (Ramhorn?)
Jabberslythe – giant manticore
Mixed Herd
Chaos Ogres
Chaos Trolls
Dragon Ogres
Dragon Ogre Drakes/Shaggoth
Preyton -Sisters of the thorn mount
Mutants
Throwing Spears
Mud Elemental

Tomb Kings:
Tomb Swarm
Dust Goblins
Guardians (Tomb Guard with 2-hnd)
Scythan Warriors
Undead Scythans
Tomb Slaves
Mortuary Acolytes
Risen Elephants
Basethi
Dread Abyssals
Khemric Titan
Necrolith Colossi (2 wpn, great weapon)
Great Sphinx
Bone Thrower
Royal Chariots(??)
War-Barques
Ushabti Great Weapons/Ancients
Lybaras Air Ship
Rasetra: Cold one riders, cold one chariots, Thunder Lizards

High Elves:
Sea Rangers
Merwyrm
Ships Companies
Dragon Princes of Old
Maiden Guard
Shadow Warriors (Shields)
Griffon

Greenskins:
Colossal Squig
Mangler Squigs
Squig Gobba
Snotlings
Pump Wagon
Bonegrinder Giant
Great Cave Squig
Maw-Krusher
Goblin Spear Chucka
Goblin Netters
Savage Orc Boar Chariot
Spider Swarm
River Trolls
Boar Boyz (Spears)
Black Orcs (2 wpn, Shield)
Night Goblin Spears
Goblins (Hnd wpn)
Boyz (Spears, 2 wpns)
Fire Kobolds
Troglagobs
Hill Goblins
Dust Goblins
Hobgoblins
Forest Goblins (Spear, hnd wpn, bow)
Draig and Da Ghostz
Oglok's Orrible Boar Boyz
Burnabommaz
Gore-Gruntas
Ogres
Silmaneth's Shadow Host
Drilla's Killaz
Hagranyms

Dwarfs:
Gnomes
Anvil Guard
Brotherhood of Grimnir\Doomseekers
Torsten Treehacker's Sea Axes
Mountain Rangers
Sea Dogs

Undead:
Kemmler's Barrow Units
Sylvanian Levy
Skeleton Crossbowmen
Strigany
Dregs
Thralls
Red Goblins
Grave Ghouls

Dark Elves:
Slaanesh/chaos units for Morathi
---Starving Hounds
---Devoted of Slaanesh
---Sorceress of Slaanesh (Lore of Pain and Pleasure)
---Slaanesh Daemons (If possible)
------Daemonettes
------Seekers
------Seeker Chariot
------Hellstriders
------Hellflayers
------Keeper of Secrets
------Muses
------Fiends
------Furies
Slaves
City Guard
Fellblades
Cold One Hounds
Whelp Master
Hydra Variants (Royal, Spellthirster, Veteran, Chameleon)
Scourgerunner Chariot
Doomsteeds
Avatar of Khaine
Aeskhaine
Khinerai
Magma Dragon
Helldrake
Doomdrakes
Xxsaster
Rephallima
Pagowyrm
RoR: Lords of Oblivion
RoR: Winterborn
RoR: The Forestburner Patrol

Norsca:
Skulex the Great Fire Drake
Fianna Fimm
Fimir Shearls
Thralls
Huskarls
Sword-Maidens

Chaos:
Mardagg
Dolgan Horsemen
Kul Kyazak
Great Spined Chaos Beast
Heirs of Change

Empire:
Free Company (2 Variants)
Merchant Cavalry
Youngbloods
Sewer Jacks
Rat-Catchers
Rakes
Roadwardens
Warhounds of Sigmar
Warrior Priest Retinue (3 Variants)
Demilancers

Kislev:
Brotherhood of the Bear
Huns
Sibyrian Wolves
Chekists

Bretonnia:
Carcassone Shepherds
Herrimaults