I'll also keep updating the list as new info is revealed .
Keep in mind this list only contains content comparison between Skyrim and Oblivion only .
-General Combat
1-Dual Wielding .
2-Dragon Shouts .
3-Finishing Moves .
4-Sprinting .
5-Auto Health regeneration .
1-Merged Cuirass and Greaves .
2-Sheathing weapons doesn't increase running speed .
3-No auto health regeneration .
-Combat:Melee
1-Magnetism .
2-Shield bashing and timed blocks .
3-Torches can be used as weapons .
4-Daggers deal massive damage in stealth mode .
1-No Long/Short sword distinction .
2-No continiuos blocking .
3-Hand to Hand is not lethal anymore
-Combat:Ranged
1-Slower but more powerful .
1-Fast but not very powerful .
-Combat:Magic
1-New spell delivery methods and mechanics .
1- No Spell-Making .
-NPCs
1-New inheritance system .
2-Children .
3-Companions .
4-Bards .
5-Relationships and marriage.
1-Dialogue wheel ,removed .
2-No Haggling sliding bar .
-Character Creation and Development
1-A new and improved character creation system .
2-Perks .
3-New skills : Enchanting , Smithing , Pickpocketing , One-Handed and Two-Handed .
1-No Major/minor Skills .
2-Removed Skills : Athletics , Acrobatics , Blades , Blunt , Hand to Hand , Mercantile and Mysticism .
3-All attributes removed .
-Misc
1-Carriage system .
2-Each hold has its own bounty system/records .
3-Economey .
4-Cooking and woodcutting .
5- 5 Major Cities .
1-No Arenas .
2- 8 Major Cities .
3-No difficulty sliding bar .