Radio silence. I wonder if they are rethinking it due to all the other intermodal announcements, or if they are just waiting till they are closer to production for a formal announcement. I would expect to hear something early next year.
This reminds me of a related update (not Trainfest related though): I saw the PWRS reps at the Vancouver Train Expo last week and I asked them about their plans for 53' well cars in N scale. The answer was basically: "yes, we're still interested, but we have other projects in the queue." So don't hold your breath. (The potash hoppers they had looked really nice though!)