Needless to say, it is not without issues. It's a beta.
Why So Soon after 1.0? It seems like just a few weeks ago that we released GalliumOS 1.0. And it was...!
GalliumOS 2.0 is based on upstream Ubuntu 16.04 (Xenial Xerus), which was released 20160421. Xenial is an LTS (long term support) release, so it will receive security and major bugfix updates for five years from Canonical.
I am not part of the GalliumOS project (aside from providing a fanfare/startup sound they have yet to figure out how to use), but installed the OS on an Acer CB3-111. The effect was to turn an internet appliance into a full-fledged, silent, slim, light, cheap, and admittedly low-storage Linux notebook. I had difficulties with the in-place upgrade from 1.0 to 2.0beta1, but with the help of the dev team on their IRC channel, I was able to resolve them. They are particularly interested in participation from people with unusual ChromeOS hardware such as Pixels and Falcos, and/or with unusual usage patterns that might reveal issues not seen by less demanding users.