The new UPsites Web Studio home page is currently only experimental, since Drupal 8 will only be released in spring 2014.
However, I enjoyed trying out the new theme layer, and doing an long-needed overhaul of my site. The current content will be imported as functionality becomes available.
The site is still in its infancy. Everything is kept simple to avoid too much change when D8 changes. Especially the menu behavior will change and will become more responsive. The content from the old site, and the new database schema for Drupal 8, will be included as time permits.