I was able to ride during previews, and I wanted to share my thoughts!
Let me know if you have any questions - I'm happy to answer what I can!
- I was able to ride from Hollywood Studios to Caribbean Beach and then switched to the Epcot line and rode through Riviera to Epcot. The AoA/POP line wasn't open when I rode unfortunately.
- Boarding is simple and easy. I rode by myself, so I'm not quite sure how the boarding process will work for groups, but for me, it seemed highly efficient.
- It's a really smooth ride. Throughout, there are narrations that tell you a little bit about where you are. It does get quiet when there are no narrations, so I felt maybe some light music would have be nice, but it's also pretty peaceful.
- Regarding air flow - You are constantly getting a nice breeze. The only time it ever felt a bit warm was when passing through the Riviera station, because you are moving slowly from unload to load. The doors open at Riviera's unload (if you are going to Epcot you can stay on), close between stations, and then re-open when you get to Riviera's load, before closing again before take off.
- There is an emergency intercom in each cabin, so you can call back to the control booth, just in case you have an emergency.
- I rode both types of cabins, but preferred the unwrapped cabins to the wrapped cabins because I found them to be easier to see out of.
Let me know if you have any questions - I'm happy to answer what I can!