Nintendo has confirmed that it will host its first Nintendo Direct from 2019 on February 13th. There will be a variety of games for Nintendo Switch included; There is no indication that 3DS games will be included. Regardless, you can search the stream later today.
In terms of what to expect, Nintendo was pretty vague. It said it will run for about 35 minutes and contains "information about upcoming Nintendo Switch titles". The only one stated was Fire Emblem: Three Houses, the new entry in the tactics series to be released this spring, but has not yet been clearly shown.
Nintendo Direct will air at 2:00 pm (5:00 pm CEST on February 14th). As usual, Direct will be featured on Nintendo's website and on its YouTube channel. We will host it here on GameSpot and provide you with the news as soon as it breaks.
In addition to Fire Emblem: Three Houses, Nintendo is also developing Yoshi's Crafted World, Luigi's Mansion 3, a new Pokemon title, and another entry in the Animal Crossing series for Nintendo Switch. However, it has not officially confirmed that these titles will be discussed during the directive.
It could be that Nintendo also announces new projects during the Direct. In particular, Metroid fans are hoping that Wii's Metroid Prime trilogy will be re-released for Switch. Especially after the recent news that the development of Metroid Prime 4 has resumed and we probably will not hear about the sequel for a long time yet.
It is also possible that Nintendo will be showing the next DLC fighter for Smash Bros. Ultimate, which became known as the Joker of Persona 5 during The Game Awards in December 2018. Pokemon developer Game Freak is also working on an RPG called "Town," which we've seen very little in. Anyway, we'll soon find out what Nintendo has in store for us.