Software announcement in the Nintendo Switch & 3DS families will be announced during the presentation.
Nintendo will be broadcasting a new Nintendo Direct presentation tomorrow, March 8th, which will be focusing on upcoming software for both Switch and 3DS.
One confirmed title promised to be talked more in depth about is Mario Tennis Aces, which we should hopefully get a definitive release date revealed. The presentation will last roughly 30 minutes.
The broadcast will go live at 2PM Pacific / 5PM Eastern.