A little clarification...
These changes aren't happening immediately. In fact, all we have is a "roadmap" broken down in 4 blog posts. We know when the blog posts happen, but as to when the changes happen, the "prelude to the roadmap" only talked of the changes discussed in the blog posts. I'm sure dates will be specified in each blog post with more details, but the changes don't happen tomorrow. Here's what kabam mike said on his "Prelude to the Roadmap" post:
This Roadmap will be made public in a series of 4 blog posts. Today, we're sharing with you a prelude of what to expect. This covers very high-level topics and gives you an insight into what is coming. There won't be a lot of information here, but the individual posts covering those topics will dive deeper into each of the topics, and more.