Apple will announce the new iPhones as early as next month with more advanced photography capabilities and upgraded hardware in a design similar to that of last year’s models, according to people familiar with the matter. The new features will be a dual-camera system on the larger iPhone, a re-engineered home button that responds to pressure with haptic feedback and the removal of the devices' headphone jack, said the people, who didn’t want to be identified discussing unannounced features. Apple declined to comment.

The new models will be critical to the holiday quarter, and Apple is counting on the phones to prop up sales ahead of an expected iPhone overhaul in 2017, the device’s 10th anniversary.

This year’s models will look similar to the 6 and 6S. They will retain the same 4.7-inch and 5.5-inch screen sizes as their predecessors, the first of which was introduced in September 2014. Apple will remove the two innermost antenna lines that run across the back of the current iPhones.

The dual cameras on the larger new iPhone will produce brighter photos with more detail. Both sensors, which each capture color differently, simultaneously take a picture, and the device produces a single, merged photograph.

The dual system sharpens photos taken in low-light environments. The combination of the merged photos from the two camera sensors also allows users to zoom while retaining more clarity. The smaller version of the new phones will not include dual lenses, KGI Securities analyst Ming-Chi Kuo said earlier this year.

Apple is also planning an updated home button for the new models. Current home buttons are switches that physically press into the phone, but the new models will have a pressure-sensitive button that provides feedback to the user via a vibrating haptic sensation rather than a true physical click.

The new iPhones will also remove the headphone jack in favor of connectivity via Bluetooth and the charging port. That will make room for a second speaker, said the people.

The new models will run iOS 10, the new version of Apple’s mobile operating system coming this fall.