This is the first release of gdx-liftoff to default to libGDX 1.9.12, a release with some small breaking changes but many more good fixes. These fixes range from barely significant (Bresenham draws lines correctly now, but no one seems to have used Bresenham very much), to very useful (Pixmap.downloadFromUrl() is a great new way to download and modify images, while ObjectLongMap helps round out support for primitive-backed data structures), to vital for lots of usage (Box2D works on GWT again without crazy workarounds!). Other than the very worthwhile changes in 1.9.12, there are some small improvements in gdx-liftoff: many third-party extensions were updated to their current versions, and if you specify Java version 8 and have an Android project, the necessary Android configuration to use much of JDK 8 is written for you.
I hope this continues a trend of more and more stable versions, released more quickly!