What's it all mean, other than craft is doing well? It means that craft is sustaining strong, reasonable growth, the kind of growth that took imported beer from 1.5% to 13% of the U.S. beer market in under 20 years. It might give us pause to realize that craft beer's growth, like imports, relies heavily on a few major drivers: Boston Beer, Sierra Nevada, and New Belgium. The three of them make up about 3/5 of craft sales. I happen to believe that unlike imports, that dominance will wane, rather than intensify. Craft's appeal continues to be based strongly in variety and local flavor, which argues against market dominance. Time will tell.
By the way, it's also good to keep in mind that these numbers don't include breweries the BA doesn't consider to be 'craft breweries,' like Redhook, Widmer, Goose Island...and a small but significant number of breweries that either don't belong to the BA or who decline (or forget...) to provide production figures.