Captain America, like many of the Heroes in the Marvel Universe of late is undergoing a grand story shift.  Robbed of his super soldier serum by the Iron Nail not only is he back to his old 98 pound weakling physique but the past 70 years have caught up with him as well.  Now, in truth, the de-serumed Cap, and the old Cap have all been done before, and there is little doubt that in time Cap will return to his regular vim and vigor if not before, then at least soon after the handsome young hero is portrayed in Avengers 2.