As many of you know, there is an OVA for this Hetalicrap anime, the name is "Giinmaku Hetalia: Axis Powers Paint it. White." It's supposed the human beings are in danger for some causes (that are not mentioned 'cause they want you to see that crap) and the U.S.A. character wants to save the world under his leadership.
Personal opinion: It's the same crap, just with another story and I've read that other secondary characters (another less important countries) will be included... Like Prussia, Iceland, etc.