Design templates for Universal Windows Platform (UWP) apps

Microsoft has updated their design template for Windows 10 apps. The new templates are in both PowerPoint and Adobe Illustrator.

https://dev.windows.com/en-US/design/assets

PowerPoint design template

PowerPoint

This deck has everything you need to quickly mock up wireframes for UWP apps, including controls and layouts.

Windows 8.1 templates can also be found on the same site.