What does the Dragonborn DLC offer in Skyrim?
This* link is a complete summary of what is included in the DLC.
In summary however,
- 7 main quests & 28 side quests
- 90 New Characters
- 90 New Locations
- New creatures
- New Magic
- 30 New Weapons
- 4 New Craftable Armor
- Plenty of new items
All of this information and more can be found within that first link.
I hope this helps!
*Be careful on the wiki as there is many a spoiler.