I have seen these rumors too, the movie looks like it is a go but from what I see at this point Disney Imagineering still denies there are any plans to make any changes to the jungle Cruise ride itself.

I can definitely see them making changes in the future by putting additional animatronics or figures in the ride to reflect the movie if it is successful just like POTC.

I just hope if they do decide to make changes they are minor changes and do not change the whole storyline of this classic ride or the corney puns and jokes of the "captains" dialogue.

JC and POTC are both must do's on all of our trips just for the nostalgia. I like riding the rides with my children that I recall riding with my parents on our visit as a child.