From the release notes:
Currently, Unity Linux offers both 32-bit and 64-bit LiveCDs. Nearly 7,700 packages are available after installation. In an effort to give distribution developers maximum flexibility, the core is kept small and usable, but not too basic. Unity Linux provides developers with the bare minimum– just enough to make use of remaster tools, the smart package manager, a 22.214.171.124 kernel, and rpm5.
You can dowload the beta release from mirrors listed here.