Today, April 5, also turns out to be the day Microsoft made the final Creators Update release (Enterprise, Education and IoT Core) available to MSDN/TechNet subscribers. Those wanting/needing to get Windows 10 from the Volume License Service Center (VLSC) will have to wait until May 1 for it to show up, sources have told me.
I haven't heard/seen Microsoft officials say when the HoloLens will be updated to the Creators Update release. Surface Hub also is supposed to be getting it some time soon (no official date yet). Windows Phone users with eligible handsets are supposed to begin getting Windows 10 Creators Update starting April 25.