Nintendo announced on Twitter that Direct will be happening in Thursday, March 8 at 2 pm PT/5 pm ET. This one will be focused on upcoming 3DS and Switch games.
The Direct will last "roughly 30 minutes" and will focus on upcoming games such as Mario Tennis Aces. Other games slated for 2018 include Detective Pikachu, Donkey Kong Country: Tropical Freeze, Project Octopath Traveler (which I'm personally interested in), and Metroid Prime 4.
Be sure to check it out tomorrow to e what Nintendo has in store.
Check out @NintendoAmerica’s Tweet: https://twitter.com/NintendoAmerica/status/971385073898532865?s=09