Google Photos version 1.1 didn't come with much in the way of changes, and the tradition looks like it's holding true for 1.2 as well. But hey, sometimes we like minor tweaks just as much. So let's go over them, and then you can rush to grab the APK.
What's New
For starters, there's the ability to easily add individual photos to albums from the drop-down menu. Here's a before and after shot.
Left: Old, Right: New
And when you're inside of an album, you also have the option to set an image as the album cover.
There's no logic to this untitled album. Please don't try to make sense of it.
Then if you tap the information icon at the bottom of the image, you can type in a description.
Here's a link to the APK, and as always, chime in with any other changes that you come across.
Download
The APK is signed by Google and upgrades your existing app. The cryptographic signature guarantees that the file is safe to install and was not tampered with in any way. Rather than wait for Google to push this download to your devices, which can take days, download and install it just like any other APK.
File Name: com.google.android.apps.photos-1.2.0.98687623-52532-minAPI14.apk
Version: 1.2.0.98687623 (52528)
MD5: 9fb6cc8928df883f90ea5f7ac2c68e34