I am installing this as i type. The cd is exactly the same as the SP1 CD from Microsoft, same lay out, same documentation etc.. The only difference is that the distribution package is labeled xpsp2. The installer main page displays Windows XP SP2 and so far its installing over my XPSP1 corp system.
LOLOLOLOLOLOLOL
Installation just failed. "Windows was unable to update the catalog files, your system may now be unusable" :P
Must be an official beta then- probably near to release as well
