That may turn out to be true, but for now, this is all that's officially been stated by Disney:
"The Walt Disney Studios is excited to be in development with Mandeville Films and writer Roger S.H. Schulman on a feature film based on the Jungle Cruise, one of the most iconic attractions in Disney theme park history. The film will pair up Tim Allen and Tom Hanks in their first live-action project, after their previous collaborations in the Toy Story trilogy.”
So.. thanks for reading, everybody! Please note I only said I was speculating! For all we know, the previously-reported storyline has been thrown own post-Dick Cook's firing and the new screenwriter being hired. For now, we don't know what roles Hanks and Allen will be playing.
Anyway, thanks for mentioning this site is where you got the info, no one!