Looks like this gives even more insight as to exactly who the Captain America on The Avengers will be:
"It felt like Bucky was doing a great job as Cap, fans dig him in the role [and] I enjoy writing him as Cap," Brubaker told Marvel.com. "And it occurred to me that Steve was going to get put through the wringer on his way back to the present, and may have reasons for not wanting to put the Cap uniform back on and go all public for a while, if not forever."
He added that Rogers would be operating in secret, "more like a James Bond for the Marvel Universe, operating covertly to save the world."