Why not? Everyone else is doing it.

- Fire Emblem Fates

- Mario & Luigi: Paper Jam

- Metroid Prime: Federation Force

- Hyrule Warriors Legends

- Bravely Second

- Mario & Sonic at the Rio 2016 Olympic Games

- Final Fantasy Explorers 

- Project X Zone 2

- Sonic Boom: Fire & Ice

- Zero Escape 3

- Ace Attorney 6

- Yokai Watch (Aus, Eu)

- Monster Hunter X (Jp)

- Shin Megami Tensei IV Final (Jp)

Not even including the near inevitability of Pokemon Z, the possible release date of Dragon Quest XI and Ace Attorney 6, or other unannounced stuff. Not too bad for a 5 year old handheld, even if not everything on this list is exactly super hyped or likely to be Game of the Year. Personally interested in Paper Jam, Fire Emblem, Bravely Second, Hyrule Warriors, Metroid, and Final Fantasy in that order. 

EDIT: Not including indies and mulitplats it shares with non Nintendo home consoles because no one else is doing that for some reason. If you want it: 

Mighty No.9, Lego Marvel Avengers, Terraria

EDIT 2: Added SMTIVF

Fire Emblem Fates (buying this much later as I'm still annoyed at the milking)
Mario and Luigi (still salty af about no real Paper Mario, but I'm still going to buy it)
Bravely Second
=Buys

Pokemon Z.... Day One

Edit: I feel like someone's going to be funny and make a "PS Vita 2016 lineup looking pretty solid," thread, but they gonna be a dick and not include anything.... 
Just have that feeling xD 

Damn, I would make a legit Vita list, but I honestly know nothing of Vita's lineup next year. :(

Wouldn't know either. Haven't bought a vita game in well over a year, as it's pretty much retired for me. ie) not interested in niche anime games, and I can play the better versions on the PS4. But I digress. 

OT: I do hope NIntendo has a few more 3DS surprises, and not the obvious Pokemon Z game  

Get that shit out of here.

Put in Ace Attorney 6 and Etrian Odyssey V instead plz.

I actually did just look into it, and almost every game it has next year's also coming out PS3/4. Actually kinda sad.

Fire Emblem Fates (both versions) - Day One
Mario & Luigi: Paper Jam - Let me play through Dream Team first, then I'll get back to you on that one.
Bravely Second - Buy.
Hyrule Warriors Legends - Still not convinced, I need more things to differentiate it from the Wii U version before I consider it.
Metroid Prime: Federation Force - Maybe.
Pokemon Z - Day One.

2016 looks like it'll be a better year for the 3DS than 2015

Quick, someone get Dr. Vita! He'll know what to do!

You forgot monster hunter stories!!!!!!!!!!!!! Lol xd

Also, what are the chances perhaps of Capcom bringing MHX over here like they did with 4 Ultimate?