This is one I'm excited about too.
From the sounds of it though, it wouldn't be until sometime next year before its available.
There was a thread somewhere about when they made the next unity course, The Complete Unity Developer 2017, and making a game like this instead of 4 or 5 small separate games.
My guess would be when it does become a course, at the end of it you'll have a basic shell of a game. Creating such a game would take a lot to complete, so it would give you the foundations, user interface, map generation, npc interaction, questing, skill trees, items, combat, and a couple of player classes. Then it would be up to you to make the rest of the classes, skills, items, quests, and maps that you want for your game.
That's my hope anyways.