Just on the magic skills: there's a screenshot which shows that there are the following skills - Alchemy, Illusion, Conjuration, Destruction, Restoration, Alteration, Enchanting (followed by Smi..., which some people have suggested is a Smithing skill, but that's btw).
So, when compared with Oblivion, Mysticism has been replaced by Enchanting. But, with 18 skills, and assuming that there'll be six skills per specialisation (combat, magic, stealth), one of the seven mentioned skills is not being considered a magic skill. I suspect that Alchemy will be considered a stealth skill.
Mysticism was always something of a dump skill. Though it was fun to play as a mystic, a weird set of spells they had. I suppose it's hard to bring in new skills without streamlining older ones, otherwise you find it hard to choose between them, but hey, it didn't stop Daggerfall players.