I heard of it in May, do you think you're going?
I'm probably not going, at least, not this year. I'm working on getting a few other wallet-killers together right now (new tower speakers for my stereo, a copy of Shadowrun for the SNES, etc) but it's something I'll probably look into next year!
As an aside, my folks live in Louisville, KY, and last year, they had an arcade expo. My dad works on / rebuilds pinball machines in his spare time, so he went to it, and had a blast! He's trying to get me to come to the next one, but I don't know if I'll make that, either.
Above all else, I'm just glad that these expos exist! Older games are about all that I play, so to have a few expos up-and-running that celebrate vintage gaming make me feel like a proud poppa :-)