Just found this post by imgur post with every single motif-to-be-added in the game!
http://imgur.com/a/uWyQI
Of course, we have the racial motifs:
Argonian
Imperial
Bosmer
Altmer
Orc
Khajiit
Redguard
Breton
Nord
Wood Elf
Then we have the exotic motifs:
Ancient Elf
Barbaric
Primal
Daedric
Dwemer
Glass
Mercenary
Akaviri
Dominion
Pact
Covenant
Soul-Shriven
After, we have the DLC motifs:
Xivkyn
Ancient Orc
Trinimac
Malacath
Outlaw
Abah's Watch
Thieves Guild
Assassin's League
And now, last and foremost, the unseen motifs:
First off, we have the Yokudan motif, which is pretty straightforward. Way of the Fire, Way of the Air, and Martial Knowledge's style.
Next, we have the Ra Gada motif, which confused me at first. It's actually just the Syvarra's Scales style.
Later, we have the Skinchanger motif. Not very much is known about this other than the fact that it has to do with Hircine.
Then, we have the Ebony motif, which is basically just the Ebony Armory set in style form.
And last off, we have the Minotaur Motif, which is the the Hide of Morihaus set in style form.
Now, we get into the juicy stuff:
First off, we got the Dromothra motif, which is the Lunar Bastion/Roar of Alkosh/Moondancer style from the Maw of Lorkhaj trial. That's pretty cool... except the armour really isn't. It looks kinda dumb for the effort you go through to get it.
Second off, we have the Celestial Motif, which is the Yokedan/Ophidian/Aetherian style from the Sanctum Ophidia/Hel Ra Citadel/ Aetherial Archive trials. A welcome addition. Never once got to play through a trial, let alone feast my eyes upon these beautiful motifs.
Third off, we have the Draugr Motif, from the Stygian/Draugr's Heritage sets. Was never one for the Ancient Nordic look, but I'm sure a lot of other people are.
Fourth off, we have the Morag Tong Motif, which is a completely brand-spanking new motif. Very chitinous.
Fifth off, we have the Hollowjack motif, which is some sort of Halloween-themed motif. We probably won't be seeing it for a very long time, but who knows? It'll probably be out before we even know it.
And last, but, probably the most amazing out of all of them, we have the Grim Harlequin motif. Which is just about the coolest motif not-in-the-game-yet. Probably another Halloween-themed motif.
No sign of the Order of the Hour/Akatosh motif. I can only dream.
And so, Akatosh revealed himself to a young Gaben, and granted him purpose.
"Grant them Steam sales," he commanded.
And obey, he did.