I'll go retail only..

Wii U:
- Super Smash Bros 4 for Wii U
- Splatoon
- Nintendo land

I borrow most Wii U games so I don't usually get them..

3DS:
- Fire Emblem Awakening
- Rune Factory 4
- Mario Kart 7
- Fantasy Life
- Shin Megami Tensei 4
- Kindom Hearts Dream Drop Distance
- Theatrhythm Final Fantasy
- Theatrhythm Final Fantasy Curtain Call
- Super Smash Bros 4 for 3DS
- Pokemon Y
- Pokemon Alpha Sapphire
- The Legend of Zelda Ocarina of Time 3D
- The Legend of Zelda A Link Between Worlds
- Bravely Default
- Conception II

Preordered:
- Project Mirai DX
- Fire Emblem Fates

My collection is smaller than my 7th gen in a similar time span but it's still a lot of games across multiple platforms. I may add then later if I have some free time.

Yeah, my 8th generation collection is growing at a smaller rate than my 7th generation did as well. I'm not entirely sure why, though.

PS4

-The Last of Us: Remastered
-The Order: 1886
-The Walking Dead: Season 1
-The Walking Dead: Season 2
-The Wolf Among Us
-Watchdogs
-inFamous: Second Son
-Tomb Raider: Definitive Edition
-Assassin's Creed IV: Black Flag
-Batman: Arkham Knight
-Assassin's Creed Unity
-Middle Earth: Shadow of Mordor
-Contrast
-Resident Evil Revelations 2
-Oddworld: New N Tasty

I also have a WiiU for when my nephew and niece come over but other than Mario Kart 8 and Splatoon I am not sure what else we have for it.

Wii U

Purchased games:

Monster Hunter 3 Ultimate
Mario Kart 8
Nintendo Land
The Wonderful 101
Hyrule Warriors
Bayonetta 2
Super Smash Bros 4
Super Mario 3D World
Donkey Kong Country: Tropical Freeze
Splatoon
Pikmin 3
Mother 1
Earthbound
Zelda: Minish Cap
Super Metroid
Metroid Fusion
Sonic Lost Worlds

Games I will purchase:

Shin Megami Tensei X Fire Emblem
Xenoblade Chronicles X
The Legend of Zelda U
Star Fox Zero
Devil's Third
Fatal Frame V: Maiden of Black Water
Mighty No. 9
Rodea The Sky Soldier
Bloodstained: Ritual of the Night
Super Mario Maker
Captain Toad: Treasure Tracker
Yooka-Laylee

DS

Purchased games:

Etrian Odyssey:Untold
Fire Emblem Awakening
Pokemon Y
Bravely Default
Pokemon Omega Ruby
Shin Megami Tensei IV
Fantasy Life
Rune Factory 4
Luigi`s Mansion:Dark Moon
Mario Kart 7
Legend of Zelda: Majora`s Mask
Animal Crossing: New Leaf
Tomodachi Life
Azure Striker Gunvolt
Ace Attorney 5
Kirby 3D
The Legend of Zelda
Zelda 4 Swords

Games I will purchase:

Super Mario 3D Land
Persona Q
Codename S.T.E.A.M
Etrian Odyssey:Untold 2
The Legend of Legacy
Stella Glow
Fire Emblem Fates
Bravely Second: End Layer
Yo-Kai Watch
Kid Icarus: Uprising
Monster Hunter 4 Ultimate
Ace Attorney vs Layton


PS4 (When I get one)

The Last Guardian
Final Fantasy 15
Final Fantasy 7 remake
Star Ocean 5: Integrity and Faithfulness
Tales of Berseria
Kingdom Hearts 3

So much yes with this list.