Days after leaking a radical new design for the Google Pixel 6, the uncanny accurate leaker Jon Prosser is back with a video featuring, among other things, an official-looking promo clip for Android 12.

The latest version of Google's mobile OS has been in Developer Preview for some time, but the video shows a playful new design, attractive new transitions, and hints at new features.

The first slide Prosser shared summarizes the upgrade, "What's new?" It's pretty standard stuff, with Google promising "beautiful new experiences," "stronger privacy and security protections," and "all your devices [working] better together."

But Google promises that "all of your devices [will] work better together.

But it's the second slide where Google puts their money where their mouth is, with a smattering of UI changes and new widgets.

First, there's a clean-looking audio player widget:

Then there are some curvy widgets that adjust screen brightness and toggle Wi-Fi and Bluetooth on and off.

Next is a volume slider, a curious widget with a pin icon, and a "work" and "home" setting that have no context whatsoever.

Meanwhile, this stylized new analog clock widget is more self explanatory:

... So is this stylish new weather widget:

But most exciting is the support for stacked notifications.

Things get more interesting when Prosser reveals Google's video promo with a montage of various Android 12 assets. It starts at 6:32.

The clip shows many things flashed up in quick succession, including a larger lockscreen clock, notifications grouped across apps in neat tablets, and even a new-look keyboard.

But the main takeaway from this clip is how smooth the animations and transitions look in the new version of Android, including widgets that stretch pleasantly when tapped or touched. Android's It's a level of sophistication I'm not used to seeing in updates, and it's really exciting to see.

Given that Google IO 2021 is just two days away on Tuesday, May 18, it would not surprise me if this video was not shown at the main keynote. If so, we need not wait long until Google guides us through these new design changes and tells us exactly what to expect in terms of promised security and device compatibility improvements. We also expect to get our first official look at the upcoming Google Pixel 5a.