Windows 10 April 2018 Update for HoloLens will begin official rollout on June 26

[Windows Central]

Microsoft will begin rolling out the Windows 10 April 2018 Update for HoloLens on June 26.
Microsoft has confirmed that it will begin rolling out the official April 2018 update for HoloLens (version 1803) in just a couple of weeks on June 26. This means that starting June 26, users using HoloLens will be able to head to Windows Update and download the latest release just like you can on a Windows 10 PC.

Full story from the WindowsCentral blog...