According to director Chris McKay, a sequel to The LEGO Batman Movie 2 is definitely in the works.
Given the success of The LEGO Batman Movie (2017), it should come as no surprise that Chris McKay has announced that he is "working on" a sequel to the film. In a brief Twitter exchange yesterday morning, when asked about whether a sequel would be coming, McKay replied:
"We are working on that rn actually! In the meantime LEGO Batman is all over LEGO 2 coming in February."
It's impossible to know where McKay and company are in the writing/development process for The LEGO Batman Movie 2, but it's nice to know they're working on the project. And as McKay said, we'll get to enjoy more LEGO Batman in The LEGO Movie 2, currently due to release on February 8th, 2019.