Just heard from him, and he says he's hoping to have it back on today. I know timescales shift so "today's" probably optimistic, but I guess at least it means it hasn't gone for good.
Sunn posted earlier that KK was speaking to Nash and that he'd post an update once he had one. As there is now a message 'This domain has just been registered for one of our customers!', it looks like Nash has switched to a new web host, so I expect it will be back up soon.