Out of the handful of new glyphs being added for hunters in Warlords, the Glyph of Play Dead is definitely my favorite. It only takes up a minor slot, so you don’t have to worry about it clashing with anything important.
The pet not only plays its death animation but also drops aggro. This is only useful in some situations, as I quickly discovered when I feigned death to get a rare elite back on my pet. Since the pet also dropped aggro, the elite mob reset and started evading. Any time you want to be able to feign to drop aggro without resetting the fight, you’re not going to want to use this.
It’s not perfect right now in beta. If the pet is moving when you cast Feign Death, it won’t play its death animation and just stops dead in its tracks. I’ve sent in the bug, so let’s hope they can fix it.
Here’s a second gif of the glyph in action.