I was just watching the 20 minute demo videos to see if I missed anything, and when Todd walks up to the Guardian Stones, he mentions there is 13 of them.
http://www.youtube.com/watch?v=5xwboyafbwc&feature=player_embedded#t=129s
Has anyone else noticed this? And if so, do you think that the 13 stones might represent the Birthsigns, because the warrior stone has the same design as the Warrior birthsign from OB and MW.
Also, at 2:18, it says you can have only one sign blessing at a time.
Thoughts?

Yeah, they will all represent what were formerly birthsigns.

Hmmm...I was concerned that in a game with no classes, the Guardian Stones were given names such as the Warrior Stone, and Thief Stone, etc.

The probable birthsign factor seems to resove that particular issue.