- 4,383
According to one of the comments on this article MS will replace any hardware that's borked by the update regardless of whether or not it's still under warranty though I guess even if that's true it won't get your saves back.
http://www.windowscentral.com/some-new-xbox-one-experience-previewers-hit-buggy-update
I can't see personally see them releasing the NXOE update globally if it's in this state. It'd be commercial suicide. Glad I didn't join the preview programme though.
To date, I have never downloaded anything that's a preview or in BETA form, though I did (couldn't resist) download the Star Wars BETA... so far system's working okay.