Are these new classes tweaked versions of Unearthed Arcana or wholly new to 5e?
— Nabil Kherfan (@kherfan_nabil) August 27, 2017
The 25+ new subclasses in Xanathar's Guide to Everything are the finished forms of subclasses that appeared in Unearthed Arcana. #DnD https://t.co/IFlbJCAYCW
— Jeremy Crawford (@JeremyECrawford) August 27, 2017