Bethesda's Pete Hines has claimed that Doom 4 will "show the world id's true potential" when it finally hits shelves.
Very little is known about the FPS sequel currently. CVG revealed last year that fantasy author Graham Joyce is penning the story of the title - but no release date or screens have been released by Bethesda.
More details of the game are expected to be revealed at QuakeCon in August.
"id Software brings a wealth of experience and expertise in the first person shooter genre," Bethesda marketing boss Hines told industry magazine MCV this week.
"To have a group like id working as an internal studio for Bethesda is a tremendous advantage.
"I think what they're working on with RAGE and Doom 4 is going to show the world their true potential."
CVG reported earlier this week that RAGE would be released next year, as id strives to polish it to perfection.