@Koz: Some of those mentioned cards are not actually legal yet, so I can't imagine them being used at Gencon, which is a little more serious than Origins.
And maybe playtesters have had a different experience, but I have never tied a game. There have been incredibly close games, but no ties for me yet. I can't see how marginal tie-breaker condition is all that relevant.
My point was that the Dark school has been largely ignored over the past 2 releases, and I acknowledged that the Warlock has gotten new resources. But that's not a big deal, because that's the case for all mages, and in-school and thus less costly for them.
@Tacullu: Drain Soul IS incredibly good. It's also ridiculously expensive, which is a concern for very aggressive builds that would prefer Drain Life for its lower cost, and the fact that as a Warlock, your best advantage (at least on the offense) is your high life. Not saying it can't work there, because I've played it a bunch of times and I love it every time, I'm just saying that the mana cost is suitably extreme and just as much of a consideration.
The other problem is that Tainted damage isnt life loss, and CAN be healed through Finite Life. I'd argue that Drain Soul is a little less aggro in that respect, since your opponent can actually still solve it; granted, if they're alive after it is cast.
I think the Warlock is in a fine position too, but to say to speculate that the design team favors him seems pretty unfounded. All other mages have gotten tons of in-school cards that they can put in their book on the cheap, and the Warlock has been untouched. Which is fine, because as you say lots of the new cards are fine with him, but favoritism? That's far from the truth.