As you may have heard, I've found my way into the Wrath beta, and started exploring the new content. I'll be posting anything I come across for warlocks as interesting here, as well as the expansion overall.
There's a few things I've seen in the beta that haven't had clear screenshots, or explained properly, so I'm going to try and clarify those things more. As well, I'm going to make this as spoiler free as possible.
If you have any specific questions, feel free to post them here, and I'll try and answer as much as I am able.
Tabard Vendor

It's been mentioned before that you can now buy retro active tabards you may have deleted. Here's how it works. When you visit the tabard vendor, there is all ingame purchasable tabards now, and you are charged for the same prices they would be normally wherever else you got them. Special tabrds like the Illidari Trophy Tabard for example, would be for sale there as well, if you happened to delete them. You'll aslo notice, you still require the needed reputation for certain tabards
Riding Crops

One of the first things I noticed was not being able to click swap in my Riding crop. When I opened my bags and found it, it seems they have now made riding crops an enchant item, and only binds to ONE mount. While it's nice to free up trinket slots, and prevents the 'lol, I had riding crop equipped' moments, it's going to be mighty expensive now to get all your mounts going. I know on my warlock alone I have 5 mounts I use regularly
Mounts in new places

This very well may be a bug, but you can now mount on Zeppelin towers, and on the Zeppelins themselves. I included this screen for you guys. A DeathKnight was beside me and mounted up, and I had to rup in the Dreadsteed is still cooler
Barbor Shop

That's me sporting my new haircut and undead features

Now most of you know all about the barbor shop by now, but one thing I couldn't wrap my head around was how you are going to be able to do anything with them when they hit live realms. If you've seen it, you know you walk up ot the chair, and you get your little yellow gears,a nd you click on it to sit down. With the one in UC having only one seat, and Org having 3 even, that would form a pretty big line, wouldn't it? Well fear not, sicne the chairs seem to be instanced. When you sit down on them, it's just you. I had a fat Tauren come up to the chair, and when he clicked on it, he disapeared into his own haircut session. This way, yo'll be able to see the changes, and not have a bunch of people sitting on your lap. Very well done if I do say so myself.
So right now I'm testing Demonology. Respecs are only 1 copper, so I've got a big opportunity to explore many builds and specs. And if blizzard does open that premade 80 test realm, I'll check that out to. All I can say about demonolgy>Metamophasis so far is... meh... It's not as OP as it looks. If anything, it's just an anti rogue ability, or something you pop in pvp if your about to die.
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Here are some screens regarding the state of the felhunter's Paranoia
As you can see, it no longer exists. Instead, we get the brain buff icon, lol. But seriously, this is nice. Gives felhunters a use in raids, and brings some more dynamics to raid demons for locks, as some will want the imp for stam buff,a nd some will need the int.
If you take out your voidwalker, you'll see where paranoia went.
HOWEVER, here is the catch. Once your voidwalker is done channelling Consume Shadows, the buff disapears.

So really, this is a nerf, as the spell has been transformed into a situational thing now instead of a passive buff.
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Green fire!
I kid, I kid. That's just me casting Chaos bolt. uploading a vid of the animation now
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Chaos Bolt Animation on Vimeo Chaos Bolt. Looks neat, might be as close as we get to green fel fire
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Changes to Haunt
Not sure if anyone's noticed, news to me, but the Affliction ability Haunt has been changed from it's original description. It used to move from target to target (anything that had corruption on it) and deal damage, but now it's a single target debuff. The best part though? All your DOTs do 20% more damage! And to top it off, when haunt's effect is up, it returns to you and heals you.

This is the change I've been waiting for. Both end tree abilities in destro and demonology are blatantly pvp, but this has some very serious pve impliations. Suddenly it's looking like Afliction might be top of the game for raid damage.