Of course, I want to believe the dates that Karen has shared, but I do trust that she is laying out what she knows.
Why would she so frankly let the cat out of the bag? Well, if you look at her filmography, she hasn't really been in a lot of EVENT MOVIES, and fanboy hype is not something she's particularly used to or afraid of.
In order to get Harrison, Spielberg, Lucas, Shia, and yes, even Karen together for another outing will take tremendous planning in terms of getting schedules straight. That means "reserving" blocks of time with your principles, and I think such a reservation is what Karen's referring to. We should at least take it that Spielberg has his eyes on filming in `11, whether or not he will...we'll have to wait and see.
I, for one, am crazy with excitement. I trust this over Harrison acting like he's "open to the idea." Lucas himself said they were working on it.
Here's for a "crazy, but great" 2012!!!!