Adrenaline Vault has an interview with Scott Miller of 3D Realms, the software company behind what appeared to be vaporware titles Duke Nukem: Manhattan Project and Duke Nukem Forever.  In the interview he explains the reasoning for returning to the 2D side-view style game for Duke Nukem: Manhattan Project (as seen in the original Duke Nukem back in '91, boy those were the days), and explains why it's taken so bloody long for Duke Nukem Forever to come out.