Firelands Timewalking is now available for testing on the 8.2.5 PTR. It will remain open for testing until Monday 10 AM PDT.
You may assemble a raid group of between 10 and 30 players, travel to Orgrimmar or Stormwind City, and speak with Vormu to access a Timewalking version of the Firelands raid.
Please use this thread for feedback and bug reports regarding any encounters, or related issues. Noting the nature of your group (Mythic guild premade, PUG, etc.) is helpful, as are any logs. Thank you to everyone who has come out to help test!