I’m going to list off the reasons why I think this rumour has come back:
1. Ever since the success of Zootopia, Disney fans have speculated how it would fit into the Disney Parks. Zootopia has animals, and we have a park called Animal Kingdom, so it’s a “natural” fit.
2. DAK has an underutilizes area in Rafiki’s Planet Watch. Rafiki has a train. Zootopia has a train. Everyone and their mother has “come up” with this idea.
3. In 2017, Disney announced that they were cloning their Shanghai coaster “Tron Lightcycle” to Florida’s Magic Kingdom. Disney clones a lot of attractions these days. Of course they could clone the upcoming Zootopia expansion in Florida!
4. Joe Rohde left WDI at the end of 2020. He was actively against Zootopia in DAK. It’s only logical that, with him out of the way, they will now add Zootopia to DAK.
5. “DAK Expansion II” on the boots. What could that mean? Of course! It’s ZOOTOPIA!!!
This seems to be more evidence based speculation rather than a true rumour. All of these pieces of “evidence” justify, to a lot of Disney fans, the inclusion of Zootopia in the near future. And while some points are plausible, here are a few reasons why we may not be seeing this anytime soon (or at all):
1. The credible “suite” of insiders on WDWMagic deny that this was ever a thing. While they certainly aren’t infallible, it’s very unlikely that this slipped past all of them. While it is also possible that this was approved incredibly recently, it is rather unlikely given the circumstances of the Pandemic, as well as the credible Indy rumour getting shelved due to the current world situation.
2. Zootopia was a smash hit in China, which is why it is coming to Shanghai. It did well over here, but it didn’t leave the greatest impact out of the modern Disney Animated films. It’s barely relevant in North America 5 years later, and it is unlikely to remain relevant by the time they would hypothetically add this to DAK (unless a sequel is planned).
3. Disney rarely clones full lands. Galaxy’s Edge was planned to be cloned. Aside from that, you have similarities between lands in the Castle Parks (although they aren’t exact clones).
4. There are multiple factors into Rohde’s retirement. You could argue that he just wanted to move on. He’s been there for awhile. You could also make the point about Disney’s dwindling desire to keep high profile Imagineers in the current circumstances. Both of these reasons take priority over a Zootopia land.
5. As Penguin pointed out, the message on the boots refers to additions already made.