I've been trying out a 20/31 impale/Bloodthirst build with an untamed blade recently. I don't notice a huge huge upgrade from 31/20 in terms of pve damage, but it's a different approach which is refreshing. Similar to what sub mentioned, I'll spam hamstring with windfury totem not only to build rage, but also to proc the UTB. When it goes off, I'll bloodrage, whirlwind, chain slam etc. It's a bit more bursty than I would like and results in a lot of untimely deaths :(. However, it's much more effective for solo farming than 31/20.

I haven't done much testing with it in pvp, but it is fun to have utb proc, blow cloudkeeper legs and recklessness and watch the bloodthirst crits. My main problem with it is that mortal strike is arguably one of the best debuffs for group pvp and sacrificing it makes me cry. I can't really see myself using this build with any other weapon though... The utb proc is just so good.

yeah, that's a first for me too :P

My race might actually be useful! :)

of course it will end up going away in the raid game, but it's something.

Unless they fix other bugs as well, you can still get to 100 Rage by staying in combat for 4 mins and casting Bloodrage 5 times. A lot more annoying without AM, but still something do to while your group rezzes/buffs.

I've tried 2h/arms, 2h/fury, DW/fury, and honestly 2h/fury impressed me the least. It's caught halfway between arms and dw fury. Arms favors the big burst, and DW favors sustained. 2h/fury offers a little bit more burst than DW (because you're using a 2h), and a little more sustained damage than arms (because of flurry), but shows off the true strengths of neither tree. The setup struck me as extremely awkward. It may come down to playstyle, but I abhor 2h/fury. I cannot understand why anyone would go fury without dual-wielding. And Aedak is smart, but don't take everything he says as inarguable truth.

As for the rest of your questions:

-Imp. Slam: With improved slam, you can chain cast it without any interference from the global cooldown. At least for warriors, GC is 1.0 seconds.

Having tried improved slam, I'm still convinced it is garbage. You can get very similar DPS results just repeatedly queuing HS and burning all of your instants, and save yourself the 5 talent points while doing it.

-DPS: By going 2h/Fury, you are going to give up a significant amount of PVP strength for what I consider a marginal increase in PVE dps. Mortal Strike is insanely popular not only because it is simple and straightforward, but because it works. Don't overlook that. I've played Fury for months, and the most agonizing part of it was always fighting healers, or enemy groups with healers. Multiple healers in an enemy group is a nightmare. That said, you can usually solve the problem, at least to a limited extent, by assisting off of an MS warrior.

It comes down to how much you PVP versus how much you PVE. It's a decision only you can make, really.

-Crit/AP are still just as important as in the Arms setup. You want as much of both as possible. Good numbers to shoot for for starting with fury are 1k self-buffed AP and 25+% crit. Less than that, and you're likely better off speccing arms until then.

-Playstyle definitely changes with fury. There is a bit of a learning curve, although more noticeable for DW fury. Instead of the "wait for rage, use MS/WW" style of Arms, Fury's playstyle is more akin to "use 5 different special attacks across the span of two seconds and wait for player's fingers to catch up." It's a lot of fun and playing Fury when juicing DPS as hard as you can or in a close group PVP matchup is incredibly frantic. You will never be without rage to use your desired attack, and Deathwish is a thing of beauty in both PVE and PVP.

Rogues enjoy a 1.0 second global cooldown on weapon swapping. Warriors definitely have a 1.0 second GC for attacks - copy to the test server and spec improved slam to see for yourself. I've heard that all melee classes have a 1.0 ability GC and casters have 1.5, but I haven't tested that.

Ok, thanks for the heads up. I might test this out tonight. :)

I know Priests have a 1 sec GC, otherwise the 1.4 sec flash heal Prophecy set bonus would be pretty worthless.

Oh, and here's some numbers regarding Improved Demo Shout in regards to a more PvP environment.

For the MS math, I used (average weapon damage) + (bonus MS damage) + (AP*speed / 14). Is this correct?

yes, if "speed" is "normalized speed."

Whoops. Yea, I meant to say I used a 3.3 constant.

Well now, isn't this interesting. Perhaps you can lend some support to my cause.