The latest leak concerning this 5.5-inch handset that is expected to show up later this week reveals 6 GB RAM, 64 GB internal storage, a Qualcomm Snapdragon 835 processor, a dual-camera setup, as well as Android 7.1 Nougat.
https://www.notebookcheck.net/Asus-ZenFone-4-Pro-specs-leak-online.241662.0.html