Hi,
I just checked Prometric. This exam is available. The Microsoft Learning site shows that the exam went live on 13 May.
Good luck!
Mike Corkery, MCT, MVP (Office Systems), MCSD (Windows Store Apps), MCITP, MCPD, MSF, etc. Please do not forget to click “Vote as Helpful” if any post helps you and "Mark as Answer”if it solves the issue.