Breakfast Topic: Six expansions?

I mean, I like planning ahead as much as the next guy, but six expansions? I read that and I actually had to sit down and think about what that means. They're already working on zones for the expansion after Warlords. Does that mean we'll get an announcement at BlizzCon? Does that mean we'll see those zones? How long of an expansion will Warlords actually be - will it be a year and then on to the next one? And then the one after that? Will we level up 5, 10, more or less between expansions? That could put us at level 160 and the year 2020, if all six take a year between releases. What would we even be doing at level 160?

I can't be the only guy scratching his head at the idea of six expansions being in the conceptual pipeline, can I? It just blows my mind. What're your thoughts, gentle readers?