While Apple fans are excited about the iPhone 6S and 6S Plus unveiling on Sept.9, the tech giant has already started working on the next year’s iPhone 7. This year’s ‘S’ version will be a minor upgrade, but the 2016 iPhone is expected to introduce radical changes. KGI Securities analyst Ming-Chi Kuo said in a research note over the weekend that the iPhone 7 will be the slimmest iPhone ever.

iPhone 7 Predictions: Slimmer Design, Six-Layer Camera, And Week-Long Battery

iPhone 7 to be thinner than the iPad Air 2

Apple and its partners are working to make the iPhone 7 as thin as 6mm, said Kuo. It means the next year’s iPhone could be thinner than the latest iPad Air 2 and iPod Touch that are 6.1mm thick. The iPhone 6 is 6.9mm thick, while the upcoming iPhone 6S is expected to be 7.1mm in thickness.

Last week, supply chain sources told DigiTimes that the iPhone 7 may feature glass-on-glass display panels. Apple may turn to the glass-on-glass technology because the in-cell display production process makes it difficult to add new features or increase the display resolution. But even glass-on-glass panels may pose certain difficulties. The current glass-on-glass technology wouldn’t allow the company to achieve a 6mm thickness for the next year’s iPhone, noted Ming-Chi Kuo.

A British firm’s technology may boost iPhone 7 battery life manifold

The iPhone 7 is widely expected to feature six-element camera lenses. While the new iPhone 6S and 6S Plus will sport five-element camera lenses, supply chain sources told Business Insider last month that the Cupertino company had placed orders for six-element camera lenses that will go into the next year’ phone. The 2016 iPhone will likely have a new chassis to differentiate from the iPhone 6 and 6S.

In another report, the UK-based Intelligent Energy has achieved a breakthrough that would allow the iPhone 7 to offer a week-long battery life. Intelligence Energy recently demonstrated its fuel cell technology on the iPhone 6. The fuel cell system was incorporated in the phone without altering its shape or size. The technology generates energy by combining hydrogen and oxygen, producing negligible amounts of water and heat as waste. According to The Telegraph, Apple is working closely with Intelligent Energy.