Rene Russo Joins Cast Of Thor As His Stepmom

It seems like we may get a look at the Goddess that raised Thor.  In case you're not aware, Odin wanted a son of both Asgard and Midgard (Earth).  He basically hooked up Gaea, the oldest goddess of Earth.  Once Thor was born, he was raised by Odin's wife, Frigga along with his stepbrother, Loki.
 
An article popped up on Variety stating that Rene Russo (Lethal Weapon, The Adventures of Rocky & Bullwinkle, The Thomas Crown Affair) has joined the cast of Thor as Frigga.   
 
Do you think this will just be a minor cameo?  I can honestly say that I don't recall really seeing Frigga in the Thor comics.  Hopefully we'll get some more confirmation on this.  If this is the case, the cast sure is getting bigger and bigger.