Interestingly, while this would appear to fit in with Lee's interest in the aftermath of 9/11 (see also The 25th Hour) -- as well as in WW2 (Miracle at St. Anna; the in-development Now the Hell Will Start) -- the project began prior to the 2001 attacks and was understandably put on hiatus for some time following the tragedy. Back then it was scripted by David and Peter Griffiths (Collateral Damage), but since it has been reworked by William Broyles Jr. (Flags of Our Fathers), though that rewrite was for a version to be directed by Malcolm Campbell. Now with Lee on board the Griffiths are reportedly polishing their original screenplay.
Although it is claimed Nagasaki will be Lee's first feature since Miracle, I see no reason to believe he's abandoned the Michael Jackson tribute he was recently said to be working on. Deadline says Nagasaki will begin shooting next year. That leaves plenty of time for the seemingly already partially shot Brooklyn Loves Michael Jackson in addition to the When the Levees Broke documentary sequel he's currently making. Let's hope Nagasaki is every bit as great as Inside Man without being too much of a rehash of its themes.