Lucas said in a statement, "It's now time for me to pass 'Star Wars' on to a new generation of filmmakers."
I hate to be maudlin, but this reads like Lucas just got back from the "you've got six months left" doctor's visit.
I do commend Lucas, though; at least he's thinking about what will happen to the property after he's gone. After he's dead, it could get chopped up and sold to people who would screw it up more than he did. By doing it this way, Lucas chose who got it.