Lieberher, along with the rest of the young cast, will return for IT: Chapter Two, which is currently eyeing a 2018 release.
I did have this scene where I climb up the tower at the end.
Warner Bros. and New Line have yet to release official details for the IT Blu-ray, but it seems pretty plausible that this scene could end up among those included.
In addition to the longer director’s cut recently confirmed by Andres Muschietti, the home release of IT will likely also include some deleted or alternate scenes.