Today DJI have released some some detailed info on the Crystalsky Monitors
The CrystalSky family of dedicated monitors offers a brighter and more reliable display screen for pilots, photographers and filmmakers who need more robust visual information than is available on smartphones and tablets. The CrystalSky series features displays up to 2000 cd/m2, which is four times brighter than a typical smartphone or tablet, allowing clear screen visibility even in full daylight.
CrystalSky monitors are available in 5.5-inch and 7.85-inch sizes. They attach directly to the new Cendence controller, and use a new dedicated mounting bracket to attach to other DJI controllers. They are designed to operate in temperature ranges from -4 to +104 degrees Fahrenheit, and can operate for up to 6 hours in ideal conditions using a secondary external battery.
CrystalSky runs optimized versions of the DJI GO, DJI GO 4 and DJI Pilot apps, and includes two microSD card slots for rapid storage and playback of encoded 4K video. CrystalSky will be available soon in three configurations: a 5.5-inch, 1000 cd/m2version for $469 (USD); a 7.85-inch, 1000 cd/m2 version for $699 (USD); and a 7.85-inch, 2000 cd/m2 version for $999 (USD).
Crystalsky and the Inspire 2 are available from the DJI Store