Corning has announced Gorilla Glass 4, the latest version of the chemically-strengthened glass that has been used in iPhones, iPod touches, and iPads. Version 4 promises “dramatically improved performance” against drops on rough surface such as jagged streets, sidewalks, and parking lots, as screen breakage is “the #1 consumer complaint, according to Corning’s research.” Corning promises that the new version of Gorilla Glass…