These rigid-structure demos always scare me. A lot of stuff is scripted or created to show off things that may or may not actually exist throughout the gameworld. For instance, they make a point of having fish jump out of the water in the pond at the beginning of this demo--we've seen no fish in the water of the screenshots or the trailer through. They might just be sprites which you can't interact with.
However, i hold out hope
This quest is less complex than the mage guild quest in Oblivion where you had so solve the puzzle with the pillar, go down fight undead and retrieve a helmet. Even "A rat problem" is far more complex.
That this quest consist of is: A random encounters, an working npc, a shopkeeper / quest giver, more random encounters, some monsters and a boss in a dungeon, find quest object. Now it's hold a secret and you can decode a puzzle and open a door, this is the only thing we did not see in Oblivion however we often got notes and books who gave quest updates and sent us to new locations. Last following the other path out you run into a dragon, I guess it's a chance for dragons at some dungeon locations as they will not fit everywhere.
In short, a decent quest but noting complex and noting who was not done in Oblivion.