The affected certifications are the commercial and academic Microsoft Certified Professional (MCP) exams, and the Microsoft Technology Associate (MTA) exams, including online proctored exams. Pricings for academic exams purchased from Pearson VUE and Courseware Marketplace will also be changed; volume-licensed academic exams will not be affected, however.
The price adjustments is expected to come into effect in July 2016 on a worldwide basis. The recent announcement, "well in advance" as Microsoft puts it, should leave enough time for customers and partners to make necessary preparations. As of now however, they would not know which way to prepare, as there has been no word on which direction the price adjustments will go, up or down. Microsoft is promising more information coming in the future, so stay tuned for updates.