CCIE Certifications Changing to Agile and Modular Revision Cycles

A nice email with this information may have gotten to your Mailbox today. The email opens up a new methodology called agile, wich will be used going forward. What do these changes mean? For what I read so far and what I have been able to research, means that there will be minor revisions every year, these revisions will bring at least 20% of changes with what you are being asked in the test. Also, there will be major changes to blueprints and actual exams every 3 to 5 years, such changes should reflect between a 50% to an 80%