photog Frank Hamilton hanging out in a silver AirStream trailer hitched in a half-empty parking lot down at Camden Yards. There were, save a few Yards employees patrolling in a golf cart in the distance, no other humans nearby. The trailer wasn't rocking, so we knocked, and out came two squinting fellow reporters/video game nerds who had just finished up their own personalized preview. (Which at least proved the invite-only set-up wasn't a pretense to lure bodies into some serial killer's clutches.) Under gloomy skies, surrounded by purple portable toilets chained together to presumably prevent people from relieving themselves on a non-game day when the janitorial staff was excused, and with only the dull rumble of an electrical generator and the highway breaking the kinda eerie silence, the trailer's interior was slick and comfy, a traveling yuppie studio apartment complete with leather couches and flat screen TV. And then an obviously road-weary Nintendo functionary--having come all the way from Nintendo's homebase in Washington state, to judge by the trailer's license plate--led us through several upcoming or recently released Wii and Gameboy DS games.