Passbook ticketing available in 13 MLB stadiums this season

Major League Baseball and Apple's quest to banish paper ticketing received a boost last night after the former revealed that 13 stadiums would offer the latter's Passbook integration this season. Seven teams, including the Oakland A's, Detroit Tigers and Minnesota Twins are signed up, with a further three to be announced separately. How long will it take before the duo hit it out of the park and get a grand slam of all 30 MLB teams? Hopefully long enough for us to learn some more baseball slang.