I highly recommend that you turn on email notifications for the Announcements category here on these forums. You can get an email when a new announcement is made, and only staff can make them so you wont be spammed.
There has been months of time to prepare, with messages both here on the forums and on the TwitchDev Discord server about this, scheduled windows where the change is temporarily live in the lead up to it going permanently live, and Twitch has tried to reach out to as many developers as they could by email who they saw would be impacted by this change.