Batman-on-Film has found out from three separate sources that Nolan's recent deal with Warners for the film "Inception" includes an agreement between the studio and himself to helm his second sequel to "Batman Begins."
This means that Warner Bros is more than happy to fund Nolan's "Inception" as long as he directs a third Batman film.
In addition, IGN has just found out that Nolan is the only screenwriter currently attached to Batman 3. Studios and guild members are required to submit work lists to the guilds of the projects that they are on. Warner Bros submitted a listing that shows Nolan as the sole writer. Apparently, neither Jonathan Nolan or David Goyer are officially involved yet.