I've chosen to use a very big-tent approach to the definition of official in answering this question.

There's a clear distinction between AL-legal and not-AL-legal sources, but beyond that everything is a lot fuzzier. Ultimately, what you have to come to terms with is that the designers haven't put a lot of stock into the idea of 'official' content. Mike Mearls says no, though, and they aren't sold as physical copies.ДЄre livestream things official? The WotC website sure seems to think so. Is Plane Shift official? They are published with a different disclaimer, one that avoids that language, and published officially by WotC e.g. Instead, there are layers of canon as typical for D&D games, where different groups make sets of different component materials and several competing sets lay claim to the 'official material only' term. In actuality, very few books include self-labeling or marketing as 'official' - the PHB does, but, for example, Xanathar's Guide to Everything doesn't and hasn't had any ads run that way (at least that I've seen - it's difficult to be certain in the age of digital marketing). That boilerplate makes it sound like there are two groups of material, 'official' and 'unofficial' material, and there are clear rules about what goes where. If we decide to make this material official, it will be refined based on your feedback, and then it will appear in a D&D book.

They arenвЂ™t officially part of the game and arenвЂ™t permitted in D&D Adventurers League events. Just because the race is described for Eberron doesn't mean it can't exist in a different form in Faern. These game mechanics are in draft form, usable in your campaign but not refined by final game design and editing. The material here is presented for playtesting and to spark your imagination. It comes up a lot because it's used in the UA boilerplate: This is Playtest Material Any equipment you are wearing or carrying isnt transformed. Your statistics other than size and speed are the same for each form. Seen as an eccentric but unremarkable race, the goats of the world have ensured their dark past is lost to the sands of time. WotC only uses the term 'official' sparingly. Planeshift: Equestria by Rynosaur94 - Created with GM Binder. What does it mean for something to be 'official'? Grung, from the 2017 Extra Life charity release One Grung Above, are even more limited and only speak Grung. Grugach, from the Elf Subraces UA, only speak Sylvan. They can read and understand Common, though. When using these rules, the merfolk, human, vampire, orc, and goblin subraces presented therein do not speak common, and neither does the new-to-that-material siren race. 6) includes optional rules for not everyone speaking Common. All the races in Planeshift: Ixalan might not speak Common

Planeshift race statistics