One of the most annoying things I hated, was finding a cool magic weapon that was usually only useful in a couple of fights before the magic was gone. Then having to go through the trouble of recharging the thing through a pain in the butt process. It would be nice to have weapons that would regenerate their power or even some way you could feed your characters mana into the weapon to recharge it.
Enchantments recharged themself in Morrowind and perhaps the devs found that over-powered. My guess is that the return of the Enchanting skill will cover that, though I feel it might all revolve around soulgems, again.