There's a Nintendo Direct airing tonight at 10 PM GMT (23:00 CET) and naturally the internet is buzzing with rumours of what we might see. As you'd expect Resetera is ripe with speculation and/or accurate reports from insiders, one such rumour comes from an administrator (Emily), saying both South Park: The Fractured but Whole and South Park: The Stick of Truth are coming to Switch. The former uses the Snowdrop Engine that was already used for Mario + Rabbids: Kingdom Battles on Switch, and the latter is, of course, an old-gen game, so neither sounds improbable and a bundle with both games is a good way for Ubisoft to provide value for Switch owners (The Stick of Truth was offered as a pre-order incentive for The Fractured but Whole on other platforms.
Whether this is actually true or not remains to be seen, but it's not the first we've heard of South Park hitting Switch, so it may very well be true.