"We're not doing another sequel next," said Carmack. "We will do a new title. It will be a shooter, with a different antagonist and protagonist. ... People who have been working in the company for a long time don't want to continually rehash their old work."

With the new game will come a new engine, meaning Carmack's oft-rumored retirement will remain a rumor for the next few years.

"In the coming years, I have things I want to do," he said. "The next generation of hardware and the next engine is very exciting. There's little doubt I'll be doing that."