Their "2011 Essential Facts about the Computer and Video Game Industry" report has some other really interesting data as well. The average game player's age is 37. Game players do skew male, but not as much stereotypes might make you think (58/42), and for frequent game purchasers, it's almost even (52/48). Also, the top selling console category is action (21.7%), but for PC games it's strategy (33.6%). There's lots more in there (mostly graphs and 40-point numbers, so pretty easy reading). 

This is work started by Dr. Marc Olano (director of the UMBC Computer Science game development track) while on sabbatical at Firaxis, and being continued by graduate student Wesley Griffin for his PhD dissertation. The paper was written by Dr. Olano, Dan Baker, Wesley Griffin, and Firaxis graphics programmer (and UMBC graduate) Joshua Barczak. It details how Civilization V can use the newest graphics cards to reduce the size of data that it stores and speed the transition between scenes in the game.

One of the Civilization V "benchmark modes" also runs the algorithm described in this paper. This benchmark has been used by several graphics industry reporters to compare the computational capabilities of different graphics cards.