According to a new report by Digitimes, Nintendo is reportedly planning to release a new Nintendo Switch model in mid-2020. The following comes from The Wall Street Journal tech reporter Takashi Mochizuki:
I reported in Aug 2019: “Nintendo has ideas for further updates to the Switch lineup after those two models to make the platform’s lifecycle long.” DigiTimes on Jan 6: “Nintendo is reportedly planning to release in mid-2020 a new model of Switch.”
Source: Takashi Mochizuki @mochi_wsj