Among the other changes hiding in Android 12 are a handful of tweaks to the app switcher/multitasking menu/recents menu. It's subtle, but Google has moved the app icon so that it no longer covers your view of the app itself. The currently selected app also now has the same vertical height as the stashed previews to the left and right, and your view of the app is just slightly smaller than before.
Developer Preview 3 is definitely the smallest update to Android 11 so far, at least when it comes to features. Still, automatically revoking permissions and Ethernet tethering support are new, and there's another change that flew under the radar — a way to bring back apps cleared from the Recents screen.
Android P introduced a rather magical ability for smart text and image selection (on Pixel devices, mostly in English). When you opened the app switcher, a.k.a. Overview or Recents, you could tap and hold on any text or image to share it to another app. This allowed users to circumvent certain apps' lack of a proper share menu, so you could send Instagram pics as proper images via other apps, instead of sending post links.
One of the most divisive (read: generally disliked) features in Android P is the new gesture navigation system, which brings all the convenience of unintuitive, non-descriptive interface elements together with precisely none of the visual space-savings you'd expect to gain from gestures. The latest Android DP4/Beta 3 tweaks the pill-based app switcher a bit, stretching the track for the slider to fill the full width of your screen and expanding app previews to be a lot bigger.
Android P DP2 introduced the very controversial gesture navigation during last week's Google I/O, and with it came a new interface for the app switcher (aka Overview or Recents). Instead of scrolling up and down to move between tiny cards of your open apps and swiping sideways to close them, you now scroll sideways between full snapshots of your open apps and swipe up to close one of them. One detail that slipped by us, though, is that this whole interface is now bundled with the Pixel Launcher, not the Android system.