An ex-developer of TT Games may have confirmed that a LEGO Batman 4 is in the works, and that LEGO Disney has been canceled, according to a Fanbyte article.
The Fanbyte website has published a brief history of the LEGO Star Wars: The Skywalker saga, revealing some unfavorable working conditions for many designers, and re-collecting many testimony in this regard. The rumors we are talking about are based on a tweet previously made by Stephen Sharpleslead, a game designer at Ripstone, but previously a member of TT Games, who worked on several LEGO games.
The developer said on Twitter that "TT continues to have more leaks than a sieve" and that he refers to the last paragraph in the Fanbyte article.
According to the inquiry, "LEGO Disney was thrown away and canceled last year", this is because it was a challenging game, but also because Dreamlight Valley contains many of the features that should have been included in the LEGO game and should have been improved, according to the aforementioned messages.
However, coming from a developer who was part of the team, it becomes quite credible, pending further investigation.