I'm shocked that Disney allowed a full ride-through video of River Journey to get out! I've only watched maybe 20 seconds of it (jumping around), but a couple thoughts:
1. It appears to basically be a full 5 minutes. While I wish it were another minute or two longer, 5 minutes is better than 4, which was a rumored duration at one point.
2. It looks gorgeous, and though I'm sure it could probably use more AAs than we're getting, as a sucker for gentle boat rides it looks like my kind of attraction.
The land itself looks stunning from the pictures. Although I remain deeply skeptical about Flight of Passage, everything else about the place looks top notch.