Firing up a HoloLens and going to Settings > Check for updates reveal that build 14393 is available to download. Due to it running a lower-end processor installing the update could take around a half hour or so.
No word on what is new with HoloLens, which has a different UI compared to PC. We'll dive deeper into what if anything is new in a follow-up article.
Thanks, Jesse M., for the tip!