Blizz stated in a watercooler that they're using the 1.12 database as a starting point. I don't think it's a stretch for people to assume that most game features and mechanics will be in their 1.12 state. The kind of stuff I would expect to see reverted would be numerous AV changes, but I seriously doubt class mechanics are going to be reverted. I'd be surprised if the threat changes that ruin pre-naxx encounters are reverted.
Extract ConsolePort to Interface/Addons. The addon can be downloaded through the Twitch app too. Make sure the addon is enabled when you log in to the game. Install WoWMapper and connect the controller to your PC via cable or bluetooth. Make sure the controller is recognized by your operating system. Log in to the game and make sure ConsolePort is enabled. Now it's time to choose your controller layout. Grats, you can now start playing the game with a controller. (Optional) Enable Action Camera for extra immersion by typing /console ActionCam full, /console ActionCam basic or /console ActionCam default, depending on whichever you prefer most. You can turn it off by typing /console ActionCam off command.