>Switch in general
Online details, voice chat and the like.
Virtual Console release date and launch games.
Release date, May 19th
Four new characters
An overview of the various game modes (single player, online, etc.)
Several new arenas and arms
Online beta/demo after the direct.
Release date: June 30th
Single player story trailer.
A few new maps, plus some redone versions of maps from the original.
>Fire Emblem Echoes
Brief overview trailer
Fire Emblem Heroes cross promotion where you get orbs, characters and other goodies when you register Echoes to your Nintendo account.
Corrin amiibos (both genders)
Release for "August 2017"
New trailer, doesn't look too different.
Also releasing in August
>Fire Emblem Warriors
Gameplay trailer showing off the following characters: Chrom, Xander and Ryoma.
More will be shown at E3
Tentative release in September.
>Zelda DLC pack 1
Info on the new hard mode (enemies do more damage, perma-death is an option), Cave of Trials.
>3rd Party/indie sizzle reel
Some new 3rd party ports, several from Square and Capcom.
>The DKC Collection
An HD remaster of Returns and Tropical Freeze along with enhanced versions of the SNES games (cleaned up visuals, camera changed to run in 16:9 without stretching)
Release date: August 2017.
>Kirby teaser trailer
Brief 30 seconds of Kirby running in a 3D environment.