Also, I don't think this is actually a new season
Take a look at the episode guide
http://www.tvtome.com/ManShow/eplist.html
According to this, 11 episodes aired. The Production codes go up to 521. That must mean theres episodes left over. Comedy Central must just be trying to not let those shows go to waste.
Unless there was an announcement aboutu a 6th season being ordered that I don't know about.