Pixel 4 owners have Google Camera 7.2 for several weeks, but those of us with older Pixels have been abandoned, many back from version 6.3 of the app. Users are now reporting that both Pixel 3 and 2 are officially updated to Camera 7.2 on the Play Store. If you have not installed the intermediate APKs, you will notice a huge change in the interface, very few additional features and a few disadvantages.
The jump from 6.3 to 7.2 brings with it all the features we saw in Camera 7.0 expires and 7.1 and 7.2 versions for Pixel 4. First and foremost, you are looking for a new interface with camera modes rotation under the shutter button and hidden but rushing options, overlay instead of the top bar. Social sharing options are also available that let you swipe your latest photo in the bottom right corner to send it quickly to an app like Messages, WhatsApp, Telegram or Instagram Stories.
Camera Overlay Menu 7.2 (left), video instead of demolition (middle), and social sharing (right).
The ability to take pictures is not available, even on my Pixel 2 XL. Touching and holding the shutter button records short, low-resolution video, but since Pixel 2 does not have a Top Shot, I can't export slightly higher frames than the Pixel 4. If you want to have Pixel 3, you can you're happier, but this is a definite setback for Pixel 2 owners.
Another bonus to Pixel 3 devices is astrophotography. Just switch to Night Sight and make sure your phone is super stable (place it on a table, for example, to test). You will receive a toast message labeled "Astrophotography On". When you take a picture while this toast is on, Night Sight will use up to about a minute to capture as much light and detail as possible. It doesn't take as long as four minutes on the Pixel 4, but it should give you decent results. In my Pixel 2 XL, no matter what I do, a toast message is not displayed and Night Sight only takes a few seconds per frame. (If you are interested in trying astrophotography on a Pixel 2 or 2 XL, you can always get this fashion APK from cstark27, which is installed separately from the main camera application.)
In addition to removing leaked photos, video resolution options are completely disappeared for the front camera. For the back you can choose whether to shoot in 4K or not. FPS settings for 4K are not available, but you can choose between 30 and 60 frames per second for non-4K. It is unclear whether the camera will use 1080p all the time if you disable 4K or "optimize" video resolution as it sees fit. In my short tests, all videos were at 1080p, so I hope this is the only one by default.
Camcorder resolution options for Camera 6.3 (left, center) versus single 4K camera switch 7.2. small changes. Now you need to touch the viewfinder to get the zoom sliders and exposure, the camera will alert you if your framing and alignment are off, and there is an option to save the selfies as you see them in the viewfinder (ie mirror).  Camera 7.2 is slowly expanding on the Play Store to older pixels, but if you have not yet installed other APKs after v6.3 and want to skip the line, you can grab this one directly from the APK Mirror.