Using aproprietaryIW4gameengine, InfinityWardbased it on an unspecified id Tech engine. Thenewenginecanaccommodatelargerworlds, enhancedgraphicdetailandmoreefficientrendering.
Infinity Ward head Mark Rubin calls Ghosts "a new sub-brand" in the CoD franchise, and it's getting anew (unnamed) gameengine to boot -- another indicator that previous characters aren't involved.
By chance Lewis also met a former engineer from videogame maker Atari, Bruce Rogers, who was developing anew graphics engine and was working on agame of his own.