Whenever they do my friendly hosting guy will swing into action and use the backups to populate a new server he is directly in control of at a data centre he used to work at and we will be back in business. My most optimistic guess is for tomorrow afternoon/evening (GMT) and my most pesimistic is before the weekend.
Worst case scenario would be there's no backup and I have to rebuild my sites from my own files, but fortunately I have a database backup in the new release format. Unfortunately it is from the fourth of January, so it misses a post or two. I'm off to see if the Google cache and a little pasting can help me salvage that, anticipating disaster....