It's probably a kneejerk reaction, but Ion's recent comments about 'getting 9.2 into player's hands first' just gave me a feeling that we could be a bit of a ways off from a reveal still.
Thinking of 6.2 and the Archimonde-Defeat/Guldan-Portal cinematic, we had about a month and a half wait after that until Legion was revealed.
Not bad really, and I could see them doing the same after the 8th. Give it another month and a bit- have a Spring event of sorts for Blizzard games in general?