Taking a stab at what games are going to be announced for the NX:
Practically confirmed
-Dragon Quest XI
Likely to happen
-Smash Bros NX (Probably a port of 3DS/WiiU)
-Mario NX (The 3D World dev team stated how the next Mario game probably wasnt going to be on WiiU, but rather on Nintendos next console instead. Galaxy 2 came out in 2010 and 3D world came out in 2013, so the timeline matches up perfectly.)
"I have no idea" territory
-Pikmin 4 (Either a late WiiU title or an NX title that slipped past the cracks.)
-Legend of Zelda (Probably a port of the WiiU version ala how Twilight Princess was handled)
-Retro Studios next project (Though DK Tropical Freeze came out in 2014, I'm feeling hopeful that at least something gets shown off in regards to this.)
Wishful thinking territory
-Warioware NX (I feel like this is bound to happen since it's been awhile since the last proper Warioware game. Plus, the tech demos the Warioware team made for WiiU eventually became Game & Wario.)
-WiiSports/NintendoLand equivalent (The obligatory pack-in title.)
-Sonic 25th anniversary game
-One of Bandai Namco's AAA titles in production for NX