Superman, Batman Sequelize?

According to Thursday's Variety, the dream could come true as soon as 2008, in the form of sequel to Batman Begins, and 2009, in the form of a sequel to the upcoming Superman Returns, and then it's called Variety's speculative.
The notion of a Superman Returns sequel, though a no-brainer, is indeed presumptive--the movie, the first Man in Steel big-screen adventure since 1987, doesn't open until June 30.
Batman Begins, the first Caped Crusader big-screen adventure since 1997, swooped into theaters last summer.
The Batman project, however, does have a screenwriter, Variety said: Jonah (or Jonathan) Nolan, brother of Christopher.
Christopher Nolan currently is directing Bale and Hugh Jackman as dueling magicians in The Prestige. According to the Internet Movie Database, he's also set to call the shots on The Exec, an action/drama penned by his sibling.
Singer's schedule is just as booked.