On his site it says it's based off the Juiced Gingerhoneycomb theme, but it's an actual Rom you flash over the first .573 leak without wiping, and after flashing it, it updates it to the newest .588 version.
Gotta say liberty 0.1 is a great gb rom. The liberty toolbox included allows for dozens of tweaks including drop down sysctl and oc. Also includes gb keyboard. I think liberty and apex are the ones to watch right now.