From GameWatcher: “Jurassic World Evolution will get its big new update on September 13th, Frontier has announced. Jurassic World Evolution Update 1.4 will add or change a lot of things the community has been asked for, including changes the sizes of key dinosaurs, giving players more Sandbox options, and adding a new Challenge Mode.”
Source: N4G PC Jurassic World Evolution Update 1.4 Adds A New Challenge Mode