DOOM 3 for Xbox, maybe not so soon

According to an interview with CNN Money, Todd Hollenshead (id Software CEO) is doubtful that the Xbox version of DOOM 3 will make a 2004 release.  "It's still up in the air," Hollenshead says. 
What's the hold up?  The article cites "user interface issues" and "limitations of the Xbox's technology". 
The good news is that the team is dedicated to solving these issues and giving Xbox owners a version that is "just as good" as the PC.  There was also talk of the Doom movie, now set for shooting this fall.  In terms of id's future projects, Hollenshead mentioned plans for a sequel to Return to Castle Wolfenstein.