Nintendo confirmed that it will host its first Nintendo Direct from 2019 on February 13th. There will be different games for the Nintendo Switch; there is no indication that 3DS games will also be included. Nonetheless, you can look for a stream later today.
With regard to what to expect, Nintendo is pretty unclear. It says it will last about 35 minutes and will offer "information about upcoming Nintendo Switch titles." The only thing he said was Fire Emblem: Three Houses, the new entry into the series of tactics, which is scheduled for release this spring, but still to be shown significantly.
The Nintendo Direct will be broadcast at 14:00 PM ET / 10 PM GMT (9:00 AEST on February 1
It is also possible Nintendo to show the next DLC fighter for the Smash Bros Ultimate, which was revealed as a joker of Persona 5 at The Game Awards in December 2018. The game developers of Pokemon also work on RPG, called "Town," of which we have also seen very little. Either way, we'll soon find out what Nintendo has to offer.