The premature unboxing video and pictures confirm the 6-inch 2160 x 1080 AMOLED display alongside new features for the dual rear cameras. The source has since taken down the its preview pages at the request of OnePlus.
https://www.notebookcheck.net/Oops-ZDNet-publishes-OnePlus-5T-hands-on-early-claims-it-didn-t-know-of-NDA.263610.0.html