Low Resolution 1,268 x 720p.
Automatic App Killing "If HoloLens exceeds its thermal capabilities, the foreground application will be shut down to allow the device to cool off," says the documentation.
Holographic Density According to the company, the HoloLens has a holographic density of 2.5K radiants and the holographic resolution is 2.3 million light points.
Holograms Distance Limitation The HoloLens has a limited field of view, which means the displays are fixed at an optical distance of 2 meters (6.56 feet). Once the user moves closer, the holograms begin to fade at about 1 meter (3.28 feet) and disappear completely when one nears 0.85 meters (2.79 feet).
Memory Limitations 900 megabytes
See the full story here: http://www.techtimes.com/articles/138243/20160303/hololens-developer-documentation-reveals-interesting-details-about-the-augmented-reality-headset.htm