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To me it looks more like an overgrown Apple Watch than a CarPlay screen.

It's a bit of both, but they meant that it's an actual CarPlay screen: it supports "select" audio/video apps and the technical way it does that is essentially CarPlay-ing them off your iPhone.

Do we know that? I would expect it works like Apple Watch apps do where compatible apps have an Apple Watch App extension on the phone that the thin Apple Watch App (which is basically just a SwiftUI GUI) talks to, rather than having the phone render and stream the whole screen.

edit: OK, some media outlets are saying Apple has told them "developers can bring over existing CarPlay apps", but there's no mention of it in anything Apple themselves have put out publicly which is why I was confused

The most concrete report I can find is Wired: (https://www.wired.com/story/apple-homeview-smart-display/)

> It doesn’t have an App Store. Instead, Apple has a curated selection of apps, including FaceTime, Messages, and Safari. A handful of third-party media apps like Spotify are available, and developers can bring over existing CarPlay apps.

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