Yeah, though I feel like it's hard to do anything too crazy with a calendar app.

I'd expect larger changes for apps related to music, tools like photo editing ones, photo galleries, etc, since they have a lot more subjectivity as to how they can be designed without it feeling confusing to use.

I have a feeling there's a reason they picked the calendar app first, and it's precisely because the changes weren't hard for them to do comparatively.