Hello, I remember reading about a player, who once he had heard the next expansion was "Mists of Pandaria", he denied himself of any and all spoilers! The name aside, he managed to avoid going to websites, hearing from other players, and continued to the play through Cataclysm. My question to you, is that once the next expansion is announced, can you deny yourself said expansion's trailer, cinematic, information leaks, class updates...etc?
For me personally I would like to do this! The only exception is to hear how classes are being updated from a close friend, but no details of spells. More or less "Yeah, DKs will be good" levels of vague detailness!