Lots of things in Conquistador needed more variety, that's one of the main things we're hoping to address in Viking.
Does this mean an extended and interesting trade system for villages too heavily defended for me to plunder? Will I be able to acquire an Ulfberht sword? How about challenging one of my butthurt underlings to holmgang?
How about longboat fast travel? Overland travel in E:C could get tedious sometimes.