Latest Windows 10 Preview build includes a dark mode

Microsoft introduce a drack mode in new Windows 10 build. If you’re a Windows Insider, you can grab the new 14316 build and try it, but some UWP apps won’t be affected by dark mode.

drack mode in new windows 10 personalization-updates-colors

Other additions included the notifications customization (choose priority level and amount of notifications per app), native Bash support (for you Linux lovers), more cross-device Cortana syncing, a ‘Find my phone’ feature (locate your phone with your PC), a slew of bug fixes, and much more.

If you want to know more details check here.