The report on the rumor of Switch 2 at Gamescom mentioned that Nintendo had booked press showings for a game they were helping to distribute.
It seems like confirmation of the Switch follow-up could be coming sooner, rather than later.
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If their expectations are so high, why would they want Nintendo's help instead of handling it themselves? Either
a) the third-party game is the same as Capcom's expected multimillion seller and is in the exact sweet spot for which it makes sense for that game to both get Nintendo's assistance with publishing while also outselling the likes of MM11 (which essentially limits this to an extremely specific projection of Mega Man Taisen's performance), or
b) these are two different games, Nintendo isn't helping Capcom distribute their expected multimillion seller and is showing something like Snipperclips or The Stretchers