Griffin McElroy for The Verge:

id Software’s mobile development branch has been shut down as the company focuses its efforts on getting Doom 4 out the door, John Carmack confirmed during his QuakeCon 2012 keynote speech.

Id Software’s mobile efforts netted several games for iPhone and iPad, including a game based on its “Rage” property, Doom Classic, Wolfenstein 3D Classic, Doom Resurrection and Doom II RPG.

Carmack explained that they wanted to bring developers from the mobile group into the Doom 4 development team, which necessitated shutting it down for now. He added that the mobile group was making money, “but it’s not a grand slam sort of thing on there.”

Carmack also indicated that there’s at least one iPhone project on the back burner, but is vague about whether it’ll get finished. One possible milestone seems to be the forthcoming release of Doom III: BFG Edition, which is scheduled to be released in October.

Carmack remains mum on what the release schedule is for Doom 4, other than to say “every decade there will be a Doom.”