From people I know that have been able to see the previews, seems to be a plussed up version of the existing "The Cosmos Fountain" show. New DK sequence and voice lines from Super Mario, Ygor, Victoria, Frank, Hiccup; some more elaborate fountain, spotlight, and LED patterns; and fireworks through the entire show. Roughly 10 minutes or so. No projections, so nothing like the Phoenix test footage from awhile back. Incredibly similar, if not nearly identical audio (narration, music) and general show pacing to what already exists.
Based on all of that, it almost seems like this was the version they had pitched for Opening Year, but due to budget and time constraints they had to supply a non-Marquee scaled back version until they could get everything put in place. If you've seen the existing show, you've already seen about 70% of the upcoming show, if what I've heard is true. One of my friends that had seen it said they preferred Cinesational.