Just announced, travelling festival featuring Bob Dylan, Wilco, and My Morning Jacket. No dates or locations announced yet, but I'll be keeping my eye on this for sure.
I saw the post about this on Facebook and selfishly hope it isn't at the Gorge, only because there's no way I could get away with going out there twice a year. I don't think there's any venue on this side of the mountains that could accommodate a festival like that though.
*edit* I just saw the list of cities that the festival is coming to, and the closest one is in California. They could still extend the festival farther into August and come to the Gorge, but it's at least not on the initial list.