Star Wars: The Old Republic Developer Walkthrough

IGN is hosting a four-part Star Wars: The Old Republic developer walkthrough video (here, here, here, and here) that features approximately twenty minutes of footage from the game, all of which is narrated by senior content producer Dallas Dickinson and producer Blaine Christine.

Between the four videos, we're shown quite a few combat scenes, some dialogue exchanges, the bounty hunter, smuggler, and sith warrior classes, the planets of Hutta, Ord Mantell, and Korriban, and more.

Why couldn't they have just developed another single player KotOR? Don't they realize what kind of addiction this game could impose on me?