I went ahead and did a quick skim/update of my Demonology Primer. This one was a bit quicker to do than my Affliction side since it's more basic. Also, I don't think there were any major changes to Demonology that would affect rotation and the like. You still should be trying to do the same basic things.
The biggest change is that the Felguard should be the pet of choice now. For a while, the Succy was beating the big guy in a pure DPS race, but I don't believe that to be the case with 4.1. I glyphed Lash of Pain before, and now I swapped that back to Felguard as noted in the primer.
Additionally, I made the same swap I did in my Affliction guides for stats where I rely primarily on Ask Mr. Robot. You can pop the stat values given there into Pawn and still make use of the addon for something in game, but I've had nothing but great results using the resource. I don't see a reason to try and do things the hard way when there's a reliable tool available. The major difference between Affliction and Demonology stat priorities is that Mastery is given a slightly higher rating than Crit (in Affliction they're the same weight). Otherwise, the hierarchy looks pretty similar, though the specific contributions (scalars) vary a bit.
Anyways, if you've been running Demo, give it a look. Let me know if there's anything I messed up. I haven't had the chance to run this spec all that much in Wrath (what with the de-emphasis on AoE and all), but I wanted to keep up with the tree changes and keep offering the primer. The Demo spec can be a whole lot of fun, and can really help you get in touch with your inner Warlock. These days, I'm primarily using it for the odd quest/daily.
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