From Newsarama: http://forum.newsarama.com/showthread.php?t=83210
One of the short stories included is:
Captain America has chosen a side, but what about the man who briefly took up his mantle, the U.S. Agent? In a story by Michael Avon Oeming and Scott Kolins, John Walker has to choose a side – the government he has always remained loyal to or the man whose legend he attempted to uphold? The answer won’t be what you think.