IGN published a nice little take on the upcoming new dungeon at this years E3, go check it out...
Blizzard designed Zul'Aman to be more of a quick dungeon, something that can be beaten in one night. This contrasts with something like Kharazan, which requires a massive time investment. The quest thread to Zul'Aman starts in Shattrath, and thereafter it's a simple matter of heading over the Hatchet Hills in the Ghostlands and starting the quest. Loot in Zul'Aman will apparently be a step above what drops in Kharazan. Though there'll be less overall items to collect, the ones that do fall from bosses will be more powerful.
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http://pc.ign.com/articles/804/804106p1.html