I am pleasantly surprised by the release of a new Microsoft exam focused on design!
Exam 74-353: Windows UX Design
This exam validates skills associated with applying Microsoft user experience (UX) guidelines to the design of Windows 8 Store applications.
By passing this exam, you will earn the credential “Microsoft Certified Specialist: Windows UX Design”
This certification complements the skills validated in the MCSD: Windows Store Apps certification.
If you plan to take this exam, the following resources might help: