ESPN reports that only four previous times have two 5-0 (or better) teams faced each other.
Remarkable that it's happened only 4 times (and only twice since your Grandma was born). You'd think it would happen every other year. So the hype is justified. I predict CBS will advertise this game.
The map at http://www.the506.com/nflmaps/2007-06-CBS2.html looks particularly monochromatic this week! Basically all red except for California.