I don't know what the deal is with the email about the hoopladev site but I got one too. I suspect (remember that I'm not speaking in any official capacity, I'm just
guessing) that somebody may have made a mistake and posted out the URL for the now defunct test site. I was told that the new CN site would reappear at the same URL as the old one, i.e.,
http://www.cloudynights.com/, when it comes back (although we will log in using our registered email address rather than our user name).
The down time is unfortunate but it's almost unavoidable when you are moving 70+ thousand user accounts and I don't know how many million posts between different hosts and software (the work required to avoid it is expensive). There were new sticky threads recently added to
every CN forum (and longer threads in the "Feedback" and "Announcements" forums) on the old site in an attempt to notify all members of the upcoming changes but many people (including myself

) don't check out the stickies regularly.
In reply to the last post: CN was indeed running on top of an ancient version of UBB.