During yesterday's half marathon, I got to DAK just as the sun was beginning to lighten the sky, and was able to take a look at the new viewing areas in the dark. It was my first time seeing them in person, but they look really nice. Even though the Dinoland side isn't as elaborate as the Asia side, the nighttime lighting on it makes it look really good.
There wasn't any evidence of testing out on the water, so I don't know if they stopped early because they knew runners were coming, if they're usually done by that time of day (~6:30am), or if they aren't working on it nightly. There were work lights on at the marina, but I couldn't tell if anybody was there (we only saw it from a distance)
Dinoland side from the bridge, with the Tree of Life on the right side (color temperature is off in this photo):
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Asia side from near the control booth:
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Dinoland side from near the yeti shrine:
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Asia side from near the yeti shrine:
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I also saw the spare(?) petals that were linked earlier in this thread. I'm not sure exactly what they are for, but there seemed to be at least 4 or 5 of them (possibly more if there were multiple rows of them) on the south side of the backstage marina
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This may or may not be related to Rivers of Light, but behind the Dinosaur show building, there were 3 wheeled containers (about the size of a airport luggage train cars) filled with black plastic patio chairs. I saw the same type of armless chairs later in the day, at one of the areas of World Showcase that had been rented out for a special Illuminations event. I have no idea if these are related to Rivers of Light, but they could explain the flat open areas behind the benches in the seating areas, which could presumably be configured for a ubiquitous upcharge event; the carts and chairs have not been here during previous races
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