User blog:Damac1214/Call of Duty: Advanced Warfare is Built on a New Engine, Says Sledgehammer

According to Sledgehammer Games co-founder Michael Condrey, Call of Duty: Advanced Warfare is built on a new engine with efforts focused fully on the next-generation version of the game.

Audio Director Don Veca, additionally commented on the new engine.

"We’ve had two and a half years to create brand-new tech to control and support this game. It’s something like 10 times the memory since this is next-gen. With all this extra memory and new mixing technology, we don’t have to compress everything. We can make things longer and let them breathe."

- Don Veca

This seems to come as great news, since Call of Duty has been using different iterations of the same engine for several years now, and Veca's comments indicate this is just one of the many benefits of the Three-Year dev cycle. However, there was no indication about whether or not this engine was entirely new, or another iteration of the same engine, as was the case with Call of Duty: Ghosts last year.