The Digital Picture has completed their review of the Canon EOS 5D Mark IV. The review does a good job of covering Dual Pixel RAW and showing you what sort of adjustments you can make in post processing using Canon's DPP (Lightroom support coming).
The feature sets included in the 5D-series have enabled them to aptly serve a wide range of photographers' needs including portraiture, weddings, events, landscapes, nightscapes, architecture, photojournalism, street/documentary photography and even sports. Canon EOS 5D Mark IV continues this tradition, taking performance, image quality and the feature set to new levels. This camera is going to take a lot of pro and amateur kits to the next level. Read the full review
I think we've seen about 30 reviews of the EOS 5D Mark IV, and I have yet to find anyone that has any serious complaints or issues with the new DSLR.