Slightly off topic, but as we walked by the Stitch Escape area in Tomorrowland the last two weeks, they have a construction wall up around the old Alien Encounter area with posters announcing the coming of the Stitch Escape.
If you listened as you walked along the wall, you can hear Stitch's gibberish being played over a speaker behind the wall. Just a small touch that I thought was kind of neat.
I agree, it seems that it will be laid out much like AE with a new storyline. But the same seating, etc.