According to Gygax, there would be seven new sub-classes, in addition to an additional level for druids beyond 14th. Of these sub-classes, we only ever saw three: barbarian, cavalier, and the thief-acrobat, in addition to the 15th level Grand Druid (and the Hierophant levels), each appearing first in the pages of Dragon and then in Unearthed Arcana. The others never appeared under Gygax's name in any form. They were:
- Mystic: A cleric sub-class "concerned more with prediction and detection than are other sorts of clerics."
- Savant: A magic-user sub-class "specializ[ing] in knowledge, understanding, and arcane subjects." Because of their deep learning, they can even learn some cleric and druid spells and, at high levels, use scrolls of other classes as well.
- Mountebank: A thief sub-class "specializ[ing] in deception, sleight of hand, persuasion, and a bit of illusion."
- Jester: Whether this was a sub-class or a new class all its own Gygax never explains, though he does reference Roger E. Moore's NPC jester class. Amusingly, he has already worked out the class's level titles in this article and presents them.
The article also covered a handful of other topics. First up was about personalizing one's character, a key facet, Gygax claims, in a role-playing game rather than a "roll playing" game. I'm not sure if this is the first ever instance where this pun was used, but it's certainly an early example of it. Of course, for Gary, "personalizing" meant one of a wide variety of adjectives to describe one's character's complexion, skin, hair, and eye color. It's both an odd thing to include in this article and a strangely literal understanding of "personalizing."
Gygax also notes that he is "retir[ing] from the position of 'sole authority' regarding the D&D game system," making way for Frank Mentzer as his colleague. He also notes that he is working closely with Francois Marcela-Froideval on several AD&D-related projects, including two "volumes." One of these is presumably Oriental Adventures but the other could have been any number of things. Finally, Gygax once again inveighs against "cheap imitations" and "knock-off" products, urging his readers to "avoid all such fringe products." I'm not certain which products he specifically had in mind in 1982, but it's unlikely to have been the Arduin series, since they were several years old by that point.