Ok, with the info from the WSJ article, at the very least now we can do some reverse-imagineering.
This will be a video screen with a window frame over the top of it, enough said.
This will be in the area immediately after load, in what was a dark room.
This scene will probably be right at the base of the ramp.
Olaf will probably be seen at the top of the ramp as you ride up, and then the scene will continue through the former vikings area.
The concept art shows shows the boats coming right up to the ice castle, so this will be where the ride reverses direction. The doors will be new (probably to give a big-reveal of the scene) because as far as I know, there are only doors on the opposite side (before the waterfalls). As she said, the ice castle will be the biggest scene in the show.
or a couple of re-skinned polar bears... "What do they know? They're tourists." -Gonzo
This animatronic should be impressive as you'll be staring at it for a while when the boat reverses direction again. Then, through the mist and down a huge (surprise, frozen) slope to the final scene, formerly the oil rig, and then unload. Then undoubtedly through a huge gift shop where they will unload more money from your wallet.
Sounds like a winner to me!