i was kinda disappointed by this last year, but i did some digging and found out why.
GW does their own Con which is almost as big as GenCon on it's own. They didnt see a reason to spread their resources.
It does give the smaller groups like Privateer Press a chance to really shine.
I like mini's and war games, but they are deep deep deep deep money pits. I don't think i'll ever play a CCG or war mini-based game ever again for that reason.

