Very true.
When MoP was leaked, nearly everyone agreed it couldn't be the next WoW expansion. Hell, people thought it would be a phone app. And what did Blizzard do when we asked? Denied it.
After MoP was announced, a lot of users agreed next expansion Blizz would most likely go all out to keep the title hidden. And now, we have a name leaked, that relates to a known major threat in WoW, that Blizzard has gone all out in covering up (Corki's Unleashed), that, as usual, they are denying.
The Dark Below, or something dealing with the same issue, is the next expansion.