The fourth tee (upper image) sits next to the maintenance center and features an all or nothing uphill shot played to a "skyline green," generally played into a stiff breeze. The USGA lists it at 137 for this week's event.
The 5th (lower image) is longer with more of a run-up approach required, and is played on nearly the same line as the previous hole. A design defect to some, but way too fun and different for most to even notice.
It also appears there are plans to alternate the distance for this hole ala the 4th at Baltusrol.