Dragon's Dogma: Dark Arisen is more than DLC, but less than a sequel. It's a re-release of the original game, with a bunch of new content, at a reduced price. It's the Ultimate Marvel vs. Capcom 3 of games about climbing up on a chimera's back, basically.
Now that you have a clearer idea of what you'll be looking at, enjoy this trailer and these screens. Dragon's Dogma: Dark Arisen makes its shadowy ascent on April 23.