The Lightroom app was missing several important features when it came out (like tablet support, inexplicably), but a series of updates has made it much more useful. The v1.2 update is rolling out today and it brings changes to cropping, adjustments, sorting, and more.
Here's the full changelog from Adobe. It's more extensive than the one listed in the Play Store.
Edit images faster by copying image adjustments and pasting them onto another photo
Crop the perfect photo with a re-designed experience on your Android device that enables you to quickly adjust, align and auto-straighten.
Easily find your favorite images! The new Segmented view in Collections give you a different way to view and engage with your photos.
Raw file support for the Panasonic Lumix CM1 Communication Camera
Screen occasionally went blank after changing the orientation from landscape to portrait.
Lightroom could crash when customers tap the sign-in button.
Fixed issue that could cause crashes when scrolling through a large collection and changing the device orientation from portrait to landscape (or vice versa).
Hardware back button was not closing any contextual menus.
Slow performance when swiping from image to image.
Copying or moving an image into a different collection was not working correctly. Please note that this issue only occurred on certain Samsung tablets.
Lightroom sometimes caused automated logouts.
Edits not visible when sharing photos to certain 3rd party apps and services.
Crash occurred when occasionally navigating from grid view to collections view.
The adjustment copying could be great if you tend to take a few copies of each photo. You can painstakingly get the adjustments just the way you want on one pic, then copy it to the others and make a few tweaks. Note: you access this with a long-press on the image. That could save you loads of time. The new collections view is supposed to save time too, but this whole system still seems awkward to me.
As always, you need a Creative Cloud subscription to use Lightroom Mobile.