I thought the magic casting and spell making was an improvement over morrowind, so if they improved on that into Skyrim, I will be happy. I usually play casters.
I have no clue how you think the spell making was an improvement over Morrowind, considering there was literally 0 difference other than that it didn't cost money and that there was ridiculous caps on what you could do.
I'd like to see a return of the enchantment skill, the ability to enchant on the fly (however, these would be temporary enchantments, similar to poisons like in Oblivion, although, obviously, potentially more powerful), with permanent enchantments done at more specific locations.