This so called Holographic Remoting will save a lot of development / deployment time. Once the connection is established, you can just press the Play button in the Unity Editor and it will run on the HoloLens device instantly.
The tooling and also Unity 5.5 is a bit unstable right now and the Remoting does not reliably work, but it is an early beta.
I’m confident this will be much better in a few weeks.
I made a video showing how to set all up and how it works in action:
Unity 5.5 beta:https://blogs.unity3d.com/2016/08/30/get-the-unity-5-5-beta-now/
Holographic Remoting app for HoloLens: