I was hitting significantly less hard with the new demo spec. My best example would be the shadowbolt. It used to hit regularly for 5k non-crit. Now it hits for 3.5k. This has to be due to losing our SP bonus from Fel Armor and losing some SP boosting buffs that I would get from just having a demon out.
I used Hand of Gul'dan which wrecked some mobs outside of the instances but it didn't seem too effective against bosses. What else did we really get for demo? Soulburn for instant Soul Fire here and there? Like I said before, I might be missing something. I might be ignoring some mechanic that plays into our favor. I'll have to mess around some more.
I didn't get to mess around with affliction so much, but from the feedback on the forums, chain dot'ing and drain tanking are a thing of the past. Many afflictions locks were quite disappointed.
Oh, and one last note about the news armors revealed. Ahem, WHY DO MAGES GET A WARLOCK SET? That is all.