I think HD Remix ran on MT Framework. Could be mistaken.
But, yeah. Pretty bizarre. They ported SF4's engine and a lot of its assets...but just for a bad mini game?
Stuff like Dragons' dogma would probably run super well on Switch too. Wish some journalist would ask them about it at e3 unless there's a ton of Capcom games announced there
They probably could have done a remake of SF2: Turbo using SFIV assets and sold it for $60 for just a bit more effort. That would have been a massive release too.
E3 is gonna be illuminating in either a really good way or a really bad way for Switch.