[Brian] Cashman also said home runs are traveling about eight feet farther so far this year compared to last season. 'It's possible that the ballpark is a home run-type park,' Cashman said in an interview before his talk. 'We'll see. The ball is going farther in every park, not just ours.'
— ESPN There's some discussion about this at a few places. Baltimore Birds Nest crunches some HitTracker numbers and concludes there is little reason to have confidence in Cashman's statement. From there, a discussion at Tango's Blog talks about how accurate the various systems are for tracking home run distance, and whether or not BIS or STATS can be trusted. It is concluded BIS and STATS are "garbage" by MGL. Also, Cashman's statement may have been based on information that is at least a week old it appears. This is the kind of discussion I have to either spend a while compounding or what for someone to come over in the comments and summarize well.