My daughter just rode from Epcot to Caribbean Beach. It stopped 4 times during the ride. She boarded at 6:10pm and got off at 6:35pm. 25 minutes for what was supposed to be a 4 minute 30 second ride. Lol
She said that it moves faster than she thought it would, but that she wasn't overly hot - even during the stops. She said it was warm since it's hot outside, but that she was very comfortable while it was moving - there was a nice breeze from the vents. There were a total of 6 people in the car and she said it could have held more.
The line to go back to Epcot is significantly longer than the original line at Epcot. She said she would be waiting a while for them to get the bugs worked out before riding again.