Eye of the North is an explosive end-of-season-style expansion pack - success in which, and indeed the rest of the Guild Wars canon, will filter into Guild Wars 2. Noobs should look away now.
Whereas Prophecies, Factions and Nightfall were separate, yet linked, chapters where anyone could start off a new character, Eye of the North is designed solely for max-level characters. It’s being built as a stepping stone for both the existing community and the GW storyline in the lead up to the all-guns-blazing sequel. It introduces villains and big bad evils, bigging up the Human and Charr races, while introducing the Asura and the Norn (all of whom shall be playable come the advent of the sequel), and giving its famed instanced gameplay an almighty send off.