The Dallas Business Journal published a story on their site yesterday that 3D Realms is planning to release Duke Nukem Forever for the PC, Xbox 360 and PS3 before the end of this year but 3D Realms says that while they had an interview with this newspaper the release date of DNF is still "when it's ready".
Here's a quote from 3D Realms co-founder George Broussard:
In what appears to be an unfortunate turn of events, there seems to have been some confusion between what was 'off the record' and what was not. I suppose we're used to dealing with gaming press and not mainstream press. Lesson learned.
While we have internal targets, dates and goals, like every developer, we are not ready to share them. What's amazing about this is that the DBJ must have assumed that we'd actually announce a date to them, and not gaming press, and that even in the light of Scott's quote of "We can't make an official announcement.", the DBJ effectively did that. Lesson learned.
The release date is still 'when it's done', and will be until the appropriate moment. Platforms have not been finalized or announced. You can rest assured that we are moving toward a goal and that the recently released teaser trailer is the start of that process and seeing more of the game, sooner than later.