Skarsgard told Sweden's second largest newspaper that he will play the same role in The Avengers as he plays in Thor.
Translated from the first paragraph via whedonesque.com:
'"The Avengers" is the dream team of superheroes, a group consisting of among others Iron Man, the Hulk, Captain America and Thor. The film is planned to premier in 3D in May of next year. Stellan Skarsgård confirms to TT Spektra that he will play the same role as in the upcoming "Thor": Doctor Selvig. Not much is yet known about the character apart from that Selvig is a scientist in New Mexico.'
Thanks to Bleeding Cool for the find!
Not much is known about Selvig? Spoilers, ahoy!
These come from a script for Thor that was leaked online.
Selvig is a scientist, Jane Foster's (Natalie Portman) colleague, and as they watch anomalies in the sky and head for cover, they literally run into Thor (as shown in the trailer).
Not too hard to see where this goes in relation to The Avengers. Seeing how Thor joins the Avengers and as Tony Stark and Nick Fury of SHIELD all are either mentioned or play a part in Thor, with Selvig being a scientist -- well, you get the picture.
Guess, we'll have to wait and see.
Thor hammers into theaters May 6th 2011 directed by Kenneth Branagh and starring Chris Hemsworth as Thor, Tom Hiddleston as Loki, Anthony Hopkins as Odin and Natalie Portman
Head on over to the Cosmic Book News Thor movie hub for more news, images and trailers.