It was early May when the Death Knight news really started coming hot and buy wow gold heavy, with Blizzard's famous midnight meeting that revealed a ton of information about the Death Knight class. It seemed like almost everyone (with a few notable exceptions) was invited, so the news came out fast. From Various Death Knight write ups, we learned about Runic power, Ghoul pets, Army of the Dead, Death Coil, "Grip of Death," and many of the other signature abilities and calling cards of the Death Knight class. Some ideas from this time, though, never did make it even to the Beta, such as segregating trees by ability and allowing the swapping of the six runes to any type you want. If you really wanted to equip six frost runes and spam Icy touch, you could. The idea of a Death Knight being unlocked simply by having a level 55 character, while not new, was solidified as well.
This mini-conference also introduced the disease spreading system in a rudimentary form, leading to some speculation on how disease spreading Death Knights might buy wow gold change the face of PvP or nub it up and break your crowd control with DoTs. Of course, the fears about Death Knights taking everyone's jobs still continued, while others complained about the news that every race could be a Death Knight.
The Friends and Family Alpha introduced the Death Knight class in a playable form to what was supposed to be secrecy, but if there's one thing the Internet's done, it's made it nigh impossible to buy wow gold keep a secret. Thus, if you knew where to look and managed to look before Blizzard started the damage control, you could get a basic idea of what the class looked like.