Neogaf member timetokill made some interesting graphs about the 3 main conferences -
Pretty self-explanatory, I separated the games into release year categories and this is what came out.
A game was "being shown" if there was footage of a game, even if it was interspliced with cuts to the creators talking about the game, showing stuff on their PCs about the game, etc. I didn't cut down to the second of "gameplay on screen" vs "no gameplay on screen" because that would've been tedious. It was more of a "showing game now" vs "talking, introducing people, segues, etc."
This was how games were revealed or discussed at the shows. If they showed gameplay or even simulated gameplay, it went in the gameplay category. If they showed only cutscenes or straight-up CG, it went in the "nothing like gameplay" category. Talking was when they just mentioned a game, and possibly a logo or concept art, with nothing to show for it.
Each game had a "type" associated with it, including whether shooting was a main or primary mechanic. I put together these graphs to show if a game's gameplay was primarily "about" shooting or about something else.
And finally, exclusivity of games to the platform. I tried to be accurate but I'm sure there will be a game or two that is actually multiplat when I though it was exclusive or visa-versa.
http://www.neogaf.com/forum/showthread.php?t=837389