This is directly from another forum that I visit. Kind of interesting?
"Splash Pages
First - http://us.media.blizzard.com/232309/_images/ice1.jpg
Second - http://us.media.blizzard.com/232309/_images/ice2.jpg
Other Stuff
Runes seem to be appearing as the image lights up. The second rune matches the "Hel" rune in Diablo 2.
In addition, there also appears to be a new "hidden image" each day, which supposedly would assemble a larger picture when completed. Each hidden image is labelled a different number, non-consecuetive.
04 - http://us.media.blizzard.com/232309/_images/04.jpg
15 - http://us.media.blizzard.com/232309/_images/15.jpg
For more speculation - http://www.sc2pod.com/news/Countdown_to_Diablo_3
Edit - More...
http://img168.imageshack.us/img168/7214/helrunefr3.jpg
A rune that matches this symbol from the splash page.