Jez Corden: (Rumor) Nintendo Showed Switch 2 At Gamescom

[Soundwave]

Slownenberg said:

Showing off to devs they want to make games for it possibly. Don't expect a reveal until probably next summer. Expect a Fall or holiday release.

I would guess a Feb/March reveal next year. The Switch 1 units they're going to ship for Q1 2024 will be largely shipped by then an unaffected by an announcement then so it won't impact their fiscal year sales. 

Of course things can always leak well before that (as Switch 1 did).