The walls had come down yesterday morning, and I took photos and video of what is there now. The attraction is officially opening on 5/6, but they were looping the pre-show video (without the sound) and showing "ads" on the LED screen while I was there. (ads are for both real restaurants/attractions/stores and fake ones).
I have photos and links to video here:
MouseSteps - Park/Resort Updates
And some larger: