The first preview of Project Spartan is now live. Microsoft has seeded Windows 10 Build 10049 to Windows Insiders, adding Project Spartan and Cortana to the Technical Preview series.
Alongside Project Spartan and Cortana, the latest build includes numerous bug fixes and improvements over the previous one, though there are some new issues in play.
As of now, the Project Spartan preview is not a ‘ready-for-everybody’ version, therefore should be used with caution. The update is rolling out to fast ring users only at the moment.
SOURCE / Microsoft