My list of Fable 3 ideas:
More and better spells
More and better weapons
More and better clothes
More legendary weapons
New and old weapons
New and old spells
New and old clothes
More and "unique" properties
More and better titles
Be able to type out your choice at the end (if you get choices)
Be able to build properties
Better trading system
A bank for you to put your money and it comes with interest
A storage room to put your weapons,trophies,toys and others
A bed for your dog (when you buy a house it comes with it)
Be able to get different allies through your choices in the story
If you're playing online and you join a friend you should be able to have a choice in either bringing a character from one of your profiles or pick a henchmen
Be able to get all legendaries more than once in a profile(trading not included)
So far those are the only ideas I have at the moment,but i'll try to think of more.