It's available now for Object Desktop subscribers. You'll probably need to uncheck the "show pre-release versions" option in Stardock Central if you've been using the beta.
It should update cleanly from the betas, but if in doubt, uninstall, REBOOT, and only then reinstall. The 5.0 release needs a reboot to start skinning after the initial install. That's something we'll tweak in a future build, but it needed more testing and didn't make the cut.
Some painting issue turned up at the last minute for the XP SP2 wireless connection dialog painting black in one bit (seems to be skin specific to SP2). It's still usable, but that's something we'll try and nail down. Along with updating the language files to support translating the new strings.