Prolly a bit early but does anyone have any clue how the 4pt10 trigger will be called and whether it will be able to be tracked with a mod such as power auras or not?

Well I like that news! Thanks for the heads up.

I was cutting a couple gems for a ret pally in my guild, and he wanted a meta.

He commented on my crit rating meta as opposed to the agi one, saying only having to use one blue gem was worth the loss of a little crit. Honestly, the thought never even crossed my mind. How big of a deal is this change? I can imagine it is hard to tell without seeing my DPS gear, but I logged out in tank gear, and servers are now down.

For me agility is at about 0.57 SEP with crit at about 0.68 SEP or so.
Assuming you can activate 6 str with your second blue gem you get

21*0.57 +10 SEP for Agi meta =21.97 (replacing a 10str/15 stam gem with a 20 str gem gives the +10 SEP)
or
21*0.68 +6 SEP for Crit meta = 20.28

So if you can activate 6 str with the second blue the difference is really small. If you only can activate +4 the difference grows.

Those SEP values obviously don't apply to you, but it's easy enough to check out and I think the difference between crit and agi are the same for most (should be, since agi only gives crit and a tiny amount of armor).

Would it be any sort of advantage to a rotation in which Execute is only used with 30+ rage. (speaking Arms here)

This would inject more Slams into the rotation, and fewer Execute's, but harder hitting Executes?

I'm not sure how one would calculate the DPS gain / loss from this modified rotation.

Improved demo - its uniqueness (well bears have it too so it depends on your raid), is that its an aoe. So far there is no add fights where that could come handy in ICC - but well see about heroic modes (thinking of Deathwisper, Gunship - assuming those adds will actually hit HARD). In general though, a druid/paladin tank should provide it on single target - in lack of those, a ret pally in your raid should bite the bullet (it really doesnt cost them anything right now).

Improved commanding shout - this one is nice to have - how much it depends on your raid setup/performance. Still probably better then dps alternatives. Notable exception would be TOC, where improved commanding was somewhat detrimental on anub, and loads of cleave fights boosted the value on unbridled wrath a lot. Still something recommended for ICC.

With the 21Crit Rating Meta using 2 blue gems wouldn't be that much of an issue. Considering you can always use ArP/Stam gemsx2 which in my opinion would be better than using 1xOrange/Yellow gem or +10stat gem. It's just my opinion i hate yellow/orange gems for my war.

Well, when you are lacking Hit rating or expertise/hit rating, or the socket bonus is that good, to worth putting yellow/orange gem in it, like 6arp or 8str, the 21 Agility+critdmg bonus metagem becomes slighty better. I'd say its insignificant.

1) Could someone explain to me why Improved Spell Reflection isn't a mandatory Prot tanking talent?

On paper this seems to be a perfect ability ... it provides passive avoidance for the tank, enables him/her to protect the party further by using the ability, and increases threat (by reflecting the spell) against caster mobs, who are in any case difficult to hold threat on with short-range aoe abilities such as Thunder Clap and Shockwave.

2) I know from the "read first, post later" thread that Devastate should not be spammed any more, but why does no one seem to advocate using the Sunder Armor glyph, which doubles its effective threat (on any group of enemies above one)?

A lot of people seem to advocate the Cleave glyph, which increases the threat of Cleave by 50% on groups above two, but the Sunder Armor would seem to be the largest TPS gain of any glyph for a prot warrior ..?

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1. The cost of two points, for such a situational talent, is why it's not considered mandatory. With how nerfed spell reflect is, and it's inability to ever reflect anything truly dangerous nowadays makes it a fun talent, but that's all. The only few situations I can see it useful for are in 5mans, and if you're struggling to hold threat in 5mans, it's not because you didn't spec into Imp Spell Reflect.

EDIT:As for your #2, I think you answer it yourself. We don't spam devastate as much as we spam cleave. One is on the GCD, the other isn't.

Never cut Heroic Strike from your rotation. I typically keep up my normal cycle sub-20% while only favoring Execute on a free GCD. Mileage may vary based on your talents, glyphs, and the particular fight though. As for Enrage, there are a number of fights it can be useful on, but don't let those be your decision-maker on taking that talent. It's not often worth it and most of the time you won't get anything from it unless you are running back and forth to respec in between every other encounter. :P

I'd definitely try to practice a little more with Landsoul's sheet over using MaxDPS. Bryntroll is a great main hand but not something you should ever think of putting on your off-hand. Heroic Justicebringer is good all-around but Cryptmaker off of the Blood Princes in 25-man is a good upgrade in general when you consider the amount of hit it allows you to drop from your gear in favor of other stats. Rawr or Landsoul's Spreadsheet would still be best to make those gearing decisions later on when you start having access to more of those pieces.