Will Oblivion retain Morrowind's linear quest concept for the main quest, or will it be possible to approach this from many different angles, changing the final outcome in the process?

Overall, the main quest is more linear than it is wide-open, but it does have sections where the actual goals for you become more open. As much as possible, we try to allow you to finish each quest in as many ways as possible. The actual very end is the same no matter what you did to get there. There are little things we can do well with our kind of game, like “get this item from this character” – especially now with our new AI system – where even something that simple opens itself up for tons of different gameplay options.