More details of the much-anticipated iPhone 6s and iPhone 6s Plus have surfaced despite Apple keeping mum. The first look of the bigger variant, which has been leaked six days ahead of its unveil, could shock Apple fans.

"Thin" is the in-thing with mobile phone makers bringing out slimmer devices to attract prospective buyers. However, the first look of iPhone 6s Plus reported to be leaked by a Taiwanese supply chain (via The Independent) could shock many as it seems to be slightly bigger than its predecessor, the iPhone 6 Plus. The picture that gives the front view of the device also reveals sensor for Force Touch technology, changed display and a bigger front camera.

The report is in sync with claim by M.I.C. Gadget that the iPhone 6s Plus is 7.13 mm thick compared to iPhone 6 Plus' 7.1 mm, while the iPhone 6s measures 7 mm thick as against iPhone 6's 6.9 mm.

MacRumors also reported that the iPhone 6s will be thicker than the iPhone 6 by 0.2 mm (overall thickness) and weigh 51.2 grams against iPhone 6's 49.4 grams.

The reason for the thicker device could be the accommodation of Force Touch technology seen in MacBook and Apple Watch.

According to reports, the iPhone 6s will have a 4.7-inch screen powered by a 1,715 mAh battery, while the iPhone 6s Plus will sport a 5.5-inch screen and a 2,750 mAh battery. However, they are expected to share key specifications like A9 chip, iOS 9, 32 GB internal memory, 2 GB RAM, 12 MP main camera, stronger aluminium alloy chassis, and improved fingerprint censor.

Apple has sent out press invites to its event scheduled to take place on 9 September. So, it is almost certain that its upcoming devices -- iPhone 6s and iPhone 6s Plus – will be unveiled on the day before it is released into the market a few days later.