From the kickstarter campaign:
Middenarde is a low-fantasy, high-mortality game of medieval strife. A pen & paper RPG system set in England in the 1450s, Middenarde challenges you to take the role of a peasant or a commoner, someone without riches or fame to their name, and bring them to greatness, or die trying. Middenarde tells the stories of real adventurers, people who aren't exceptionally gifted or exceptionally lucky, but still have to make a living. Some of them end up as the skeletons that always litter the floor of dungeons. Others survive, but bearing the marks of their trials, missing limbs and scars. They are ordinary people, like you and me, trying to leave their mark on the harsh and divided landscape.
Classless: In Middenarde, you are not typecast. Like in real life, what you are good at is what you pursue, and no two characters must end up alike.
Statless: Human beings are not defined by statistics, but the strength of their initiative, the skills they hone, and the favor of God. Simply put, there is no system of several physical and mental attributes (Strength, Endurance, Charisma, etc.) that govern a character's ability.
Accurate: The book includes a detailed description of the setting, written by a British archeologist, and the equipment is accurate to the time period.