SAN FRANCISCO - Apple unveiled two new iPhones - iPhone 6s and iPhone 6s Plus - during a special event held at the Bill Graham Civic Auditorium on Wednesday.

As its previous iPhones with a "S" suffix, the new iPhones are incremental upgrades to its predecessors.

The biggest feature of the new phones highlighted during the event was the screen's pressure-sensitive "3D Touch" capabilities. Similar to Force Touch found on Apple Watch's display, users can press against the screen to bring up a menu or options. For example, users can call up a menu to check in at location on Facebook without even starting the app.

Both iPhones feature the new A9 processor and an improved 12-megapixel rear camera (up from 8-megapixel previously) that is able to shoot 4K (3,840 x 2,160 pixels) videos and "Live Photos".

These live photos, which Apple introduced yesterday, essentially turns photos into GIF-like short videos. This is achieved by capturing moments before and after the picture was taken.

The front-facing camera also got an upgrade with an improved 5-megapixel camera for selfie lovers. The camera can fire a flash using the phone's display. In addition, it is now able to shoot panoramic pictures as well as slow-motion videos.

Appearance wise, the new iPhones look exactly like its predecessors. The iPhone 6s still sports a 4.7-inch with a screen resolution of 1,334 × 750 pixels while the iPhone 6 Plus' 5.5-inch display has a screen resolution of 1,920 x 1,080 pixels.

However, both iPhones are slightly 0.2mm thicker than its predecessors with with the iPhone 6s measuring at 7.1mm and iPhone 6s Plus at 7.3mm. But they are now built with less-bendable 7000 Series aluminium shell. It's clearly a step to prevent last year's "Bendgate" fiasco from recurring.

Both iPhones now come in a new rose-gold colour to add to the existing gold, silver and space grey options. There is still no 32GB version for its new phones and the new iPhones will come in 16GB, 64GB and 128GB versions.

The iPhone 6s will retail in Singapore starting from $1,048 (16GB) and the iPhone 6s Plus will start at $1,218 (16GB).

Pre-order starts Sept 12 and the new iPhones will hit Singapore's shores on Sept 25.