Everyone's excited about the warlock tanking glyph for demonology. I'm cautiously excited. It's one of those things we warlocks always put on our wish lists, alongside green fire and warlock flying mounts.
While we still wait on the flying mount, EU CM Wryxian noted that green fire might be in the works! As soon as I saw the glyphs that change cosmetic things like the felguard's weapon or the color of a bear's fur, I went hunting in the datamines for green fire. I didn't see one, but Wryxian says there's "hope" that we'll get a quest for green fire. I do hope it involves Gorzeeki Wildeyes or Mor'zul Bloodbringer as a throwback to the old Dreadsteed epic mount quest chain.
I'm also aware that this is beta, and betas are for testing things, not for setting things in stone. Like Wryxian's statement about fel fire coloring, things can and will change. I want to be realistic about demo tanking. I don't want the hype surrounding warlock-style tanking to lead to disappointment. Looking at some of warlock and tanking mechanical history, I have some major caveats that Blizzard would need to address if warlocks are to become tanks.