yeah nerf they've been doing cartoons like that for years, you wouldn't even know it
I know that Mulan and bits of Aladdin used tweening, but in Mulan particularly it looked kind of crappy. I was more keen on an engine which could be used for games, converting 3d to traditional 2d-like lineart without any intermediate 2d artist stages necessary.
i.e. from 3d to something like this:

The Old Republic surprised me tbh, the screenshots don't do it justice for how good it looks in motion, achieving something sort of halfway there.