According to Kilmer's Wikipedia page, as of June 2018, he has signed on to be in the film as "Iceman"...………….oh and there's also this; After previously denying persistent rumors that he had been diagnosed with cancer, Kilmer said in April 2017 that he had a "healing of cancer". In a profile for The Hollywood Reporter, it was revealed that Kilmer had a "two-year battle with throat cancer...and a procedure on his trachea has reduced his voice to a rasp and rendered him short of breath.
So there's that.