However, with Goyer having recently landed the job of writing the Godzilla reboot for Legendary Pictures, it seems he's unavailable to put the finishing touches on his own Man of Steel script. Hence why another writer (who's worked with Snyder before) has been charged with the task.
Moviehole has learned that Snyder's 300 co-writer Kurt Johnstad has been recruited to handle rewrites on Man of Steel in Goyer's absence. The site has also learned that Jonah Nolan (Christopher Nolan's brother and co-scriber for The Dark Knight) previously "took a pass" at Goyer's script as well.
Goyer's involvement with Man of Steel has long been viewed as a mixed blessing by fans, considering that his script work is rather hit-or-miss; for every Blade II or Dark City he's worked on, there also seems to be a Blade: Trinity or The Crow: City of Angels on Goyer's resume. Those concerns were only heightened earlier this year when the writer penned a non-cannon Superman short story titled "The Incident", where Superman "renounced" his American citizenship - to much controversy, of course.
Between the recent shakeups in the DC comics universe and Snyder announcing his intention to fix the "broken" Superman movie franchise, longtime fans of the classic superhero have been concerned about what changes are being made, in order to "modernize" the character for the 21st century. While Snyder will lend his technical prowess and sense of visual flair to Man of Steel, the task of developing a new take on Superman has primarily been in Goyer's hands. Hence worries from fans, since Goyer has (as mentioned before) a relatively inconsistent track record.
Johnstad re-teamed recently with Snyder on the script for the spin-off, 300: Battle of Artemisia, but it's difficult to say what exactly he brings to the table, as far as the Man of Steel script is concerned. Most likely, he's just polishing off the screenplay and smoothing out any potential problems (re: flat dialogue, muddled action) that Goyer doesn't have the time to handle on his own.
On the other hand: confirmation that Jonah Nolan also did actual work on the Man of Steel script should go over well with fans, since the three previous Chris Nolan-directed films he co-wrote (Memento, The Prestige, and The Dark Knight) were arguably the best screenplays on his brother's resume. So, all in all, this update on Man of Steel reads as definitely being a good thing.
Man of Steel is expected to reach theaters by December 2012. We'll let you know when the film has secured an official release date.