ModScene.com has posted a brief interview with id's Graeme Devine (thanks ShugaShack). The talk reflects the post-release lull that id Software apparently is in now, as this quote shows:

MS: Do you have any future project in consideration at Id you can speak about, and if so, are efforts going to be made to insure end-user modification will continue?

GD: Right now we're working hard on the point release and getting the source out the door for the game. It's a quiet time here really.