Well... let's have me an analysis.
First, I'm also calling bullshit on the posters. Most definitely fake - the movie is still in the discussion phase, dammit!
Second I'm going to present two ideas - two entirely different premises based on whether Ledger would be replaced or not.
REPLACED
Villains: The Joker (mainly as a manipulator in Arkham), Harley Quinn (A la Two-Face), The Penquin (Ugly mob boss rising to mighty godfather)
Plot: The Joker is incarcerated, and Batman is on the run, fighting crime whilst accepting those of the deceased Two-Face. As the police, their resolve stronger after the Dark Knight affair, begin to shut down the mob, the Joker charms his psychiatrist, Harleen Quinzel, stealing her phone and, using it, contacts a former henchman - the deformed, sociopathic Oswald Cobblepot.
A penniless bum with eyes on aristocracy, Cobblepot was formerly a con artist before joining the Joker. Oswald, tormented since youth by the name of Penquin (due to his glandular obesity, stumpy, waddling gait and long, crooked nose) is asked to spread chaos by joining the mob. However, smart enough to run on his own two feet, Oswald insted takes the idea for himself, hoping to collapse Gotham into his headquarters for a new criminal empire. He cons a nightclub from its owner and begins racketeering, obtaining much of the north of Gotham as the Batman clashes with his mob henchmen.
Meanwhile, the Joker begins to mould the quiet and timid Harleen into his twisted mirror image, manipulating the reforming games in their psychiatry sessions and eventually reversing the roles as Harleen, who believes she loves the Joker (her pumpkin'), laps up his worldviews and slips into insanity as his abuse and mind games crack her psyche. Eventually, she takes a razor blade (in a scene reminiscent of both the Jokers mirror scene from Batman and the Catwoman sewing scene from Batman Returns) and carves herself a permanent Nicholson or Comics-esque rictus grin before tearing up her red and black dresses and stitching a costume for herself, taking the moinker Harley Quinn.
After a number of clashes with both the police and the ever growing, Penquin managed mob, Batman begins to doubt his abilities in a city that despises him for doing the right thing. He, as Bruce Wayne, encounters Cobblepot at a socialites gathering. Cobblepot, who has used his ill gotten gains and become a self-claimed-self-made man, attempts to con Bruce out of Waynecorp. However, Bruce recognises Cobblepot for who he is after he utters his characteristic laugh (a wheezing, athsmatic blend between a chuckle and a guffaw) and leaves, confronting and interrogating the Penquin (Burton-ish outfit, but with more of a mod feel, eg black and white two piece suit or a drab grey blazer and a scruffy white shirt). Just before he cracks, though, Harley Quin (wearing her costume and messy white facepaint and black lipstick and three black freckles on each cheek).
Quinn assaults the Batman and eventually slices his stomach across his belly button with a kitchen knife, penetrating the gaps in his armour (Harley's madness is childishly psychotic, making her unpredictable and effective. She also continuously hums the nursery rhyme "Three Blind Mice"). Leaving him for dead, she escapes with the Penquin. Harley then proceeds to feign loyalty to him, while, in actuality, she follows the commands of the Joker ringing in her head (Harley eventually develops schitzophrenia, hallucinating that her "pumpkin'" is in front of her, in his straightjacket [which is purple and green in her hallucinations], barking orders and leading her to their cherished anarchy).
The nightclub where the battle occured is investigated by the police. Commisioner Gordon finds Batman and, instead of arresting him, brings him to his home and, with the aid of his wife, 10 year old son and 16 year old daughter, nurse shim back to health, never removing his mask. Batman remains unconcious (blood poisoning?) for several days. When he awakes, he speaks to Gordon, and, as a thanks and a show of respect, leaves him his mask. Gordon, who did not see Batmans face, places the mask on his mantel.
The film culminates in a collosal mob war, as the Penquin and his legions storm the city, as Harley duels with the Batman. However, as the Penquin revels in his near victory, he begins to aspyxiate due to the smoke and dust from the gunfire. When he reaches for his inhaler (which began in the film as a shabby, cracked blue one and became a perfect condition one, a gold one and culminated in platinum) he realises it is not there - instead, a card with a jesters face on one side and a joker smile on the other alerts him to the treachery of Harley. As the battle rages on, he is shot point blanc in the chest by his own minion, as his flailing around got in the way of the shot as it was fired.
Batman eventually pins Harley to the floor, and, after a lengthy dualogue over the morality of men and the state of the mind, brings her to Gordon, asking for her to go to state prison as opposed to Arkham. Quinn, who had been secure in the belief that her "pumpkin" was at the end of the road for her, begins to writhe and scream before curling into the fetal position, sobbing, in the back of a paddy wagon.
Here, the film ends. However, there is an after-credits scene wherin a hand with long, painted fingernails takes the Batman mask down from the mantel...
Ok... I'm going to put the second bit uo tomorrow - I'm tired now. If anyone wants to comment on my overlong post, go ahead!