This is new? I was aware of this "feature" before Vista came out.

The 1 hour time lapse is to allow anyone with an invalid version of Vista to backup their files before blackout.

[Edit]
I can't find an article (after a quick search) but I did find this:
http://www.neowin.net/index.php?act=view&id=38289

Maybe I was just thinking about an unactivated Vista after 120 days?

If so, my bad.