No but I do have a request. Don't get your hopes up. Just because of one glyph and a couple tank abilities doesn't mean you can suddenly queue as a tank in DF. Shamans have rockbiter and a shield, doesn't mean they can tank. They are just giving locks an option to absorb damage and tank for scenarios if you don't have a plate class / real tank.
Pure mitigation never works. You need avoid to go along with it, and like I said there is no sign of that unless they are adding cloth with dodge and parry. You take every hit, while another tank can actually avoid a hit. There would be no reason to have a warlock tank vs a real tank.
Not to even mention, if Blizz was intending on letting locks tank, we would have heard about it at blizzcon. Hell I think that question was asked at the Q&A class panel.