New Preview Build is now available for Xbox One Devices. The update isn’t major however it optimizes Xbox Universal Store and the Store should be faster than before.
To get the update: Go to All Settings -> System -> Console info & updates. The updated version is rs1_xbox_rel_1608.160830-2138.
Microsoft will continue to improve Xbox One with the upcoming preview builds. Previously, the company added Cortana (Digital Assistant) support on Xbox One last month.