The Chromixium OS devs were asked at the point in time by Google to cease the use of the name “Chromixium” for their GNU/Linux operating system because of infringement, despite the fact that Google doesn’t yet use that name on any of its projects.
Now back to the Cub Linux 1.0 Release Candidate, it looks like the Linux kernel 4.2 has been implemented, along with an updated graphics stack from the Ubuntu 15.10 (Wily Werewolf) operating system, as well as all the new branding (artwork, icons and theme) to reflect the new name of the project.