Okay so I was combing through the pictures of background survivors and I came upon a picture of one the men seen exiting the bus in the Season 3 finale I thought this could be Roy Stark.
136px-Extra25 (The Suicide King)

He looks like he isn't too old, you know, older than Rick or Daryl but younger than Hershel. Roy Stark was described as having a military background, and he seems to have his a short and cropped maybe signifying a military background.

I don't know if this could be him, I am just throwing a suggestion out there, since no one else more able-bodied than him was showing getting off the bus, and "Roy Stark" is set to be in Episode 4x1, this might be him.