Microsoft revealed their plans for Microsoft Build Developer Conference which is expected to held at The Moscone Center in San Francisco, CA. However the Build conference will start from March 30 till April 1, 2016.
In the Build Developer Conference, Microsoft will be talking about their future devices like  Lumia and HoloLens. Along with devices, the company is also expected to talk about next missions for Windows 10 and Windows 10 Mobile.
Source: Microsoft