Valhalla Knights 3 is scheduled for release on January 31, 2012. The PlayStation Vita game supports ad-hoc connectivity like the earlier titles. When you defeat monsters and Valhalla Knights 3 will have tons of them you can collect loot.
First print copies of Valhalla Knights 3 includes a code for a Butterfly of the Night takeout pack, which adds an extra character to the "entertainment" district.
For more about Valhalla Knights 3 check out this batch of screenshots.