Glyph of Siphon Life - Increases the effect of your Siphon Life spell by 20%.
Siphon Life is the bread and butter of Affliction Warlocks. It's nice instant damage, and the health it gives back is nothing to sneeze at. I expect most Affliction Warlocks will try to fit this into their rotation, especially in PvP.
Glyph of Howl of Terror - Reduces the cooldown on your Howl of Terror spell by 8 sec.
8 seconds off a 40 second cooldown is good enough that I expect you'll see a good amount of PvP Warlocks go for it, especially if they're affliction. It should make getting focused fired a whole lot less uncomfortable, assuming your targets aren't hiding a way to break fear (Which is, unfortunately, pretty likely).
Glyph of Corruption - You Corruption spell has a 4% chance to cause you to enter a Shadow Trance state after damaging the opponent. The Shadow Trance state reduces the casting time of your next Shadow Bolt spell by -100%.
This is a very interesting Glyph, since it's basically giving away a talent for free. If this talent stacks with Nightfall, I expect you'll see a lot of Affliction Warlocks grab it. Even if it doesn't, they still might and use the talent points for something else. For Warlocks who don't take Improved Corruption, this is probably less desirable.
Glyph of Healthstone - You receive 30% more healing from using a healthstone.
Here's a nice all around bonus for Warlocks who use their Healthstone a lot, whether while being focus fired in PvP or to recover from a Life Tapping spree. I'd expect it to see this glyph in wide use. To bad it doesn't work on any Healthstone you make.
Glyph of Searing Pain - Increases the critical strike bonus of your Searing Pain by 20%.
I have to admit, I've never had much use for Searing Pain, but there are Warlocks who use it as a quick nuke in PvP, so they may get some mileage out of this glyph. I honestly do not expect it to see wide use though.
Glyph of Immolate - Increases the periodic damage of your Immolate by 20% but decreases its initial damage by -10%.
For those who use Immolate as part of a PvE damage rotation, this feels like it should probably work out to a bonus overall. I suppose the initial damage nerf is so it doesn't become overpowered in PvP. It really depends on whether our end game damage rotation manages to get away from Shadow Bolt spam or bust.
Glyph of Shadowburn - Increases the critical strike chance of Shadowburn by 20% when the target is below 35% health.
This is definitely nice for finishing off an enemy in PvP, which seems to be the main use of Shadowburn. Of course, even in PvE it may be useful for when some mob needs to die yesterday. I expect this to be mostly a PvP glyph.
Glyph of Soulstone - Increases the amount of health a player gains from resurrecting via your Soulstone by 100%.
This one is a bit iffy to take if only because most Soulstones are used for wipe recovery, where the amount of HP you rez with doesn't really matter. If you expect your Soulstone to be used for popping back up in the middle of battle a lot, this might be worth it, but this is one that I expect not to be used much.
Glyph of Death Coil - Increases the duration of your Death Coil by 0.5 sec.
Oh, I can hear the sweet, sweet tears now. If you're PvP, you should probably take this just to tick off the other classes. But seriously, Fear isn't the most reliable of crowd controls these days, so having a bit more strength to our most dependable emergency crowd control is pretty boss.
Glyph of Unstable Affliction - Decreases the casting time of your Unstable Affliction by 0.2 sec.
Faster casting on Unstable Affliction is welcome, but 0.2 seconds doesn't feel like quick enough to make a difference. There's a lot of awesome glyphs I think would give more utility. Bump this up to, say, 0.5 seconds? Yeah, then we'll talk.
Glyph of Conflagrate - Reduces the mana cost of your Conflagrate by -20%.
Well, if you plan to use Conflagrate to any great degree, this is probably worth taking. Now that we probably won't have as much stamina gear at our disposal due to gear consolidation, having to Life Tap less is especially welcome. This Glyph's usefulness will mostly depend on whether a damage rotation that incorporates Immolate/Conflagrate is viable in end game PvE.
Glyph of Health Funnel - Increases the chance you'll resist spell interruption when channeling your Health Funnel spell by 100%.
I'm thinking this Glyph is too situational to see much use. If you're soloing with your pet as a tank, chances are they have the mob's attention and you can channel without interruptions. If you're raiding, chances are you're either out of any area damage effects so you can DPS properly, if your pet is even out or on the attack at all. Even in situations where it might be useful, the new spell interruption rules means your pet will always get at least 50% of the Health Funnel anyway, which is probably enough.
Glyph of Shadow Bolt - Reduces the mana cost of your Shadow Bolt by -10%.
If Shadow Bolt spam is still king in Wrath, expect this glyph to be on every raiding Warlock in existence. It's really that simple.
Glyph of Curse of Agony - Increases the duration of your Curse of Agony by 4 sec.
Assuming the new final tick keeps up the exponential damage growth of the Curse, this glyph could end up being very popular among Affliction Warlocks. It might add more damage than you'd realize.
Glyph of Banish - Increases the duration of your Banish by 5 sec.
Banish just doesn't work on enough mobs for this glyph to see much use, I think. If Glyphs are simple to swap, you might see Warlocks swap this one in right before an elemental or demon heavy instance though. It's nice when it does work, it just feels far too situational to keep in all the time.
Glyph of Fear - Increases the damage your Fear target can take before the Fear effect is removed by 20%.
PvPing Warlocks should definitely like this, although it seems like many Fears are broken early in PvP anyway by myriads of fear breaking abilities and items or by diminishing returns. Still, if you can get a fear to stick, or if fear kiting is your preferred solo PvE play style, this glyph may be worth taking.
Glyph of Felguard - Increases your Felguard's physical damage by 20%.
Glyph of Voidwalker - Increases your Voidwalker's health by 20%.
Glyph of Imp - Increases your Imp's spell damage by 20%.
Glyph of Felhunter - Increases your Felhunter's spell damage by 20%.
Glyph of Succubus - Increases the duration of your Succubus's Seduction by 3 sec.
Here's a nice selection of pet Glyphs that do an admirable job of playing to their demons' strengths. If you use one type of demon often, these may be useful. Imp is probably less useful since most people will continue to keep him permanently phase shifted as a buff bot. I'm also a bit confused as to why Felhunters get spell damage. Does Shadow Bite work on spellpower, or was that a mistake?
For Soul Link Warlocks who don't care about having a spell interrupt or seduce ready, Warlocks being called to crowd control, or deep Demonology Warlocks, though, their respective glyphs may be worth it.