I've been messing around in WOTLK beta for the past few days. I'm on the road this week with the laptop, so I won't be able to post screenshots till Thur/Fri when I get home and back on the main rig. What I can tell you is as follows:
The zones are GIGANTIC!!! Much larger than each zone in Outland. Each zone has several different feels. For example: Howling Fjord has wastelands, ice-capped mountains, a nordic city infested with mega nasties that won't let Vrugz in (ya, I tried and died about five times)
I have tested Demonology spec with the warlock, and the elemental spec with the shaman. I will put up talent info and my "tester" knowledge by the weekend.