I reckon it'd be nice to have a DLC that involves time travel of some sort. Now, as an evil player, I'm getting sick and tired of the fact that the people who make Fable always seem to assume that the player is a good guy; all the DLCs that I know of either involve quests where you save people or something neutral, and even the main storyline in every Fable game they assume you're good; I feel like an evil warlord helping a cat climb down from a tree.
So, I'd like a DLC that involves going back in time to Oakvale, before Reaver sacrificed the entire town for his own immortality, and actually being the one who corrupts him. This would be justified to good players as Reaver is needed to save the world in Fable 2, so essentially it's still for the greater good, but you may have your own reasons for doing it (ie. for the epic loot, because if you don't then the world will have been destroyed and you'd never have been born, etc etc.)
Also, a DLC that actually allowed you to do something as the king/queen would be nice, some sort of royalty pack. Seriously, there aren't any perks to being king/queen, not even any special side quests! When I became king I expected people other than those essential to the main storyline to come to me with problems, ''bandits are planning an attack on my village, send your guards!'' and all that. I also expected some control over those guys in the armour, you know, my army? What's the point in having guards if they're never needed? It'd be nice if I could have other people do things for me. Also, a clothes making system would be nice in a DLC; as king, surely I should have my own personal tailors?
**SPOILER ALERT**
Also I'd like to see something that gives me a bit more choice, you don't get many choices in Fable 3. You get to choose good or evil, but it never branches out and the most consequence you'll get is the occaisional ''I don't like you'' and maybe less people in the streets. So, perhaps I didn't actually kill that evil darkness creature that possessed Walter? Perhaps walter, still possessed, comes out from his grave. Without Walter's consciousness to battle, it now becomes overwhelmingly powerful to the point of actually being some sort of challenge! A little difficulty would make a nice change in Fable 3. Anyway, it comes to attack you first, but you defeat it. Now, here's the twist; it tells you that Walter's body is weak and yours is strong, and offers to join you. You get the chance to become one being with it, as Walter was in the final battle, and of course this causes considerably more pronounced character morphing than the usual that you'd get in the game, like perhaps the character becomes more deathly pale than is possible simply being evil and has black vains going all around their body (the blackness would be the creature itself, and the fact that the character is so pale could be interpreted as the creature having demolished their humanity to the point where they no longer have blood, perhaps the player died and only their consciousness is left with the creature, and the body is merely a shell now with two hosts? Now, if the player refuses, the creature goes one by one to kill all of the player's friends (or former friends if they rejected promises.) The player must protect or ignore their deaths, and if the player ignores them all, the creature makes the offer again, attacking the player if they again refuse. If the player saved them all, the creature attempts to simply kill the player again. If the player originally agreed to join the creature, then they go on missions at its request to kill their now former friends, though they can of course refuse. If they refuse to kill any friends, the player gets a chance to separate themselves from the creature and fight it.
**SPOILER END**
Oh, and I'd also like to point and laugh hysterically at joslen1's signature thingy telling people not to use 1337speak, and how it says that it uses correct grammar. I know joslen1 didn't write it and I'm just having a bit of fun, I'm not trying to be very offensive (maybe a little to who ever did write it,) but it spelled 'don't' wrong. Simple typo, but when it gets so stressed about people using incorrect english xD