From The Dragon #65 "Classes to Consider"
CLERIC — Mystic: This subclass of clerics is concerned more with prediction and detection than are other sorts of clerics. All mystics are of Good alignment, although they can be chaotic, neutral, or lawful within the Good alignment. As with other sorts of clerics, mystics would have seven levels of spells, but most would be of the sort to divine or detect. However, some new spells, and some very powerful upper-level spells, are planned.
MAGIC-USER — Savant: This sub-class of magic-user specializes in knowledge, understanding, and arcane subjects. Thus, as do mystics, savants possess a fair range of detection spells. Although they know many standard sorts of spells as well, savants have many new magics in the nine levels of spells possible for them to employ. Savants, can use spells common only to clerics and druids, and at higher levels savants can read and employ scrolls of all sorts. Because of the scholarly aspects of this proposed class, elven and half-elven savants are envisioned as being able to progress several levels higher than if they were normal magic-users; i.e., 14th or even 16th for elves, 10th or 12th for half-elves. Savants can be of any alignment.
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I know details can't be given, but may I ask: what were the sources of inspiration for these two proposed character classes? Where could enterprising AD&D players look for the source of these ideas to draw on material, possibly to create their own versions of the proposed sub-classes?