Apple will unveil a new iPhone that many analysts believe will not have have an analog headphone jack, possibily leading to a significant shift in the way people listen to digital music and other audio. During its annual fall product launch event Wednesday in the western U.S. city of San Francisco, California, the world's most valuable publicly traded company is expected to unveil an iPhone 7 that will be incrementally improved with features such as a touch sensitive home button that vibrates and dual lens cameras for the larger 'Plus' edition. The iPhone 7's are also expected to have faster processors and more memory. Other than some new colors, the new iPhones will look similar to the models Apple has been selling since 2014. The elimination of iPhone's analog headphone jack could mean future iPhone users would need wireless listening devices or those with a cord that fit into the port that is used for recharging the phone. Some analytsts believe Apple may ship the new iPhones with adapters that allow older headsets to plug into the charging port. Despite a decline in iPhone sales, Apple is believed to have scrapped its two year development cycle, meaning a major revamp of the iPhone will not occur until 2017. iPhone sales dropped two consecutive quarters this year, the first declines in the history of the device.