They'll show gameplay of it running on the Switch revision, but I highly doubt it'll launch this year. Didn't they already say in the last direct that there would be more news in the Fall? That doesn't sound like the wording they would use if it was releasing.
I'm weird because I'm way more upset about using "of" instead of "have" in the title than I am about the making of a thread about a tweet that merely contained a hypothetical.
BoTW2 is surely far into development. Will it release this year? I say yes if the Switch pro releases this year. If that's delayed into 2022 then Zleda gets delayed with it.