FAA Approves Boeing’s Battery Fix for 787

example on airliners.net: "The cracks are on the outer glass surface, which is non-structural. The glass is used as a wear surface since it resists scratching and pitting much better than the acrylics that are used for the main structural part of the window. So a "broken window" is not a big deal at all."

nytimes: " “Even considering that the 787 is a new aircraft, which tends to come with initial glitches, we are not seeing a higher incidence of reported problems compared to other aircraft,” Mr. Yamada said."