I like this rumor a lot, but it is just a rumor, and CinemaSpy evens says so in their exclusive - Chris Pine is on the short list to play Captain America in the live-action Joe Johnston film of the same name.
I'm sure he's been talked about, whether he's on a list or not. He's got the look, the charisma, and the right amount of up-and-coming star power to play the role. Remember, the person that plays Captain America will need to lead the team of Iron Man and Thor in the eventual Avengers film. This means he needs a comfortable command presence; you need to be able to buy that Robert Downey Jr. (as Tony Stark) would take orders from this man. I think Pine has that quality - certainly in a way that Sam Worthington (also rumored for the role) does not.
We'll have more as it develops - Captain America: The First Avenger should be assembling its cast in the coming weeks. What do you think of Pine as Cap?