This is Furukawa, President of Nintendo. We will make an announcement about the successor to Nintendo Switch within this fiscal year. It will have been over nine years since we announced the existence of Nintendo Switch back in March 2015. We will be holding a Nintendo Direct this June regarding the Nintendo Switch software lineup for the latter half of 2024, but please be aware that there will be no mention of the Nintendo Switch successor during that presentation.
Nintendo has cancelled all convention and events appearances for the year such as PAX and Gamescom. If they had anything to show off it would be during those two events. With everything cancelled I think they are going the route for the late year announcement like they did with the Switch which was revealed in October 2016 and released in March.
I predict we won't hear anything until September/October.