Source: IGN
Be sure to check out the GamingHeaven review over here
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In Eye of the North, you won't find new starting areas and professions like in Factions and Nightfall. It's an add-on expansion strictly for level 20 players, offering loads of additional content. The big focus here is on PvE (player versus environment). Of the 150 new skills added to the game, only 100 are viable in PvP (player versus player), and that's pretty much it for that portion of the game. As a result, the PvP side of things remains largely unchanged, as players get no new modes or professions. This seems to follow the trend since Nightfall of ArenaNet putting more and more emphasis on PvE aspects. With Nightfall came heroes, customizable and controllable NPCs, which lent a certain Dungeons & Dragons flavor to solo adventuring. That's not a negative - many players love to quest by themselves and welcome the opportunity, which exemplifies the versatility of Guild Wars' design. Eye of the North expands the single-player element further, adding in 10 more heroes and providing a new narrative campaign which can be beaten almost entirely without human help.