Apple will unveil a new iPhone that many analysts believe will not have an analog headphone jack, potentially leading to a shift in how 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 models also are 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. Eliminating 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 used for recharging the phone. Some analysts believe Apple may ship the new iPhones with adapters enabling 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 iPhone revamp will not occur until 2017. Sales of the iPhone dropped for two consecutive quarters this year, marking the first declines in the device’s history.