At least for me, and what I know so far, my favorite change/addition is the fact that there will be more of a variety of voice actors.
I assume you are a young one , since I don't care that much for voice acting I prefer a game of hours of fun even without voice acting than a game with much voice acting but with little gamplay ...
Even for that matter I still play Morrowind with limited voice acting and pretty much the seem, but still the topic's I can open in Morrowind are plenty more than Mudcrabs and Deadra on the Road in Oblivion ...