HumanHead has released details about the game's plot and central character Ragnar, as laid out in this press release. Screenshots are available on HumanHead's site if you're curious as to what the game actually looks like. Here's an excerpt with some background info on Ragnar:

Players take on the role of Ragnar, a young Viking warrior on the brink of a sacred ritual into manhood. With his physical prowess, intelligence and cunning skills, Ragnar shows great promise at becoming a prominent warrior. He desires to prove his worth to his village and take his rightful place beside his father, a great elder warrior who trained Ragnar in the way of war and to respect the power of the Aesir, the gods of Norse legend. Ragnar is a follower of Odin, the father of Asgard (the Viking heaven) and Thor, the god of thunder.

Ragnar strives to use his warrior skills to protect his village, and champion all that is right and just. Just before the ceremony begins, Ragnar and his village learn that another Viking group, the Dark Vikings, led by the brutal chief Conrack are pillaging and plundering their way through the lands, destroying all creatures in their path. Hoping to prove his skills and powers, Ragnar follows his father and other village warriors to defeat the enemy. However, as they sail off to fight their enemies, a raging storm breaks onto the scene, causing swelling waves and gushing winds. The ship is suddenly sucked into a whirlpool and into the Norse underworld.