Ah, you are right. That would make Soul Fire get surpassed at essentially all gear levels, and it would also make backdrafted incinerates better than searing pain above 50%.

I tested again and nowhere near the same results, I guess I had been slightly lucky with crits and proccs on my soulfire attempts.

Anyhow a question.
What glyphs should destruction be using come patch 4.0.1? Immolate and Conflagrate to me seems like pretty demand, but should the last be imp or should it be incinerate assuming immolate > Conflagrate > Chaos bolt > Instant soulfire > Searing Pain rotation under 50% (including doom ofc)

The last time I tried that the 2 Dark Intents do indeed stack. I had 2 DI Haste Buffs, the one from the other lock and my own.
However that was a few builds ago.

A few things you overlooked:
-I don't know the Fire Mage rotation, but their new Flame Orb spell is a channeled DoT.

-Resto Shamans have the new Healing Rain AoE heal as well as the Earthliving Weapon enchant which, when it procs, places a HoT. Earthliving Weapon, when glyphed has a 40% chance to place another HoT on heal and if I recall correctly, shamans can currently dual wield Earthliving-enchanted weapons. This makes Resto Shamans an appealing choice for lack of Resto Druids, Shadow Priests, or Affliction Warlocks.

-Death Knights: Unholy also gets the Unholy Blight DoT which ticks for 10% of Death Coil's damage every second for 10 seconds. Thinking this might be another opportunity for Dark Intent procs, I tested this on PTR to see if it crits and it does not. So Unholy DK's are no better a target for DI than Frost.

An interesting mechanic presented itself with this though, because Unholy Blight is 10% of Death Coil's damage, perhaps this is the reason it does not crit? I've heard reports from Holy Priests on PTR that their mastery effect does not crit either, and it follows these same rules. This would lead me to believe that Ignite and, by the same token, Burning Embers ticks would also not crit, severely reducing the usefulness of DI on Fire Mages, Holy Priests, and the Imp.

Yes, the point was that macro is client based and will add a double latency minimum gap between Drain Life casts. While the best way to do would be with a quartz like cast bar that shows latency, no macro and doing the 2nd Drain Life as soon as the cast bar enters the latency area.

About that, I'll quote Keldion's post from another forum:

I don't expect that to be implemented for 4.0 though. I'm not sure if it is for Mind Flay, but it definitely is not for Drain Life on the PTR.

Fair enough - the essence of the conclusion will remain the same: cast Demon Soul:FG and Meta at the same time. Can ID proc multiple times per cycle? I've assumed that it can when scoping out talents - but haven't worked out the specific probabilities of n procs given m casts.

Over the last few days, I have worked on a spreadsheet to illustrate the differences in Drain Life and Shadow Bolt scaling with their respective talents. The context of GC's recent comment about predicting Shadow Bolt filler was clearly centered around Cataclysm PVE; it matters not one bit if he is incorrect only in relation to the 8 remaining weeks in Wrath.

Drain's coefficient took a hit in PTR build 13156, resulting in a more linear DPSC scaling that effectively runs parallel to SB without additional Mastery taken into consideration.

L80 Affliction PTR DL/SB Comparisons

Hm, I'm a little surprised it was a basic scaling nerf to DL. While it would most definately settle the issue right here and now, I was a bit worried the Mastery would eventually overcome this, and I mean within reasonable ranges. And that's the problem really. Blizzard can't nerf DL too much, or else it would be a wholly useless spell, something that clearly isn't the intent. But they still want SB to be the filler, while not scaling with Mastery. That's the recepie for conflict. And it seems that the crosspoint is lower than I expected (85 numbers should be somewhat different though). But the cross is actually a fair bit lower since it doesn't take Nightfall into account. The amount of extra procs with DL is non-negliable.

So, either it will be a constant rebalance of SB and DL, something I doubt Blizzard is interested in doing, since the last few attempts at that have been less than impressive. Or, they will even the playingfield between the two spells, either by taking DL out of the Mastery (the boring and perhaps least balanced result) or they make SB scale with certain selfbuffs, SE seems the most suitable candidate.
The problem with taking DL out of the Mastery is obvious, it simply becomes obsolete rather fast.

It's a mess really. And I don't see why Blizzard doesn't at least try DL out as viable. It doesn't have to be the only option. Much like Fire Mages and Fury Warriors get two options, Affliction Warlocks could be tested out with DL. And it wouldn't even have to be through the tree. It could be a glyph that increases DL's damage by X% and reduces the healing by Y% (not that I think it is terribly needed). One of the greatest arguments for DL is that it fits so very nicely, while SB doesn't.
If people are happy with DL, despite it's weakness as a channeled spell (something Blizzard does want to fix due to Spriests), then keep it. If it is unpopular due to those same weaknesses, then it can be shafted in 4.1 or something.

As there is nowhere else currently to discuss this, I thought here would be best, despite this being related more to the upcoming patch than the actual upcoming expansion.

I currently play Demo on live, and plan to continue to do so in 4.0.1 and in Cata. The L80 Demo spec I have come up with for 4.0.1 looks like this:

WoW Talent Calculator - Sigrie

This also includes glyphs.

Looking at the stats for demo, the stat priority order would probably look something like:

Hit -> Haste -> Mastery -> Crit.

With excess hit and crit being reforged into Haste. Gemming would look like:

Red: +10 Int +10 Haste
Blue: +10 Haste +10 Hit
Yellow: +20 Haste

Any opinions or discussion on this would be greatly appreciated. If this is the wrong place to post this then I apologize and would be happy to take an infraction, but here did seem best.

*Editted because I stuffed up the first time

Is anyone able to confirm this? I don't really have access to PTR due to Australia's lack of internet quota. Even in that case though, you would simply gem Int/Haste in yellow sockets instead.