A new report by the Wall Street Journal has outlined Apple's plans for iOS 7, including a new "starker and simpler" design. However, the report states that Apple is planning "conservative" changes. From Neowin:

The Wall Street Journal has published a new report which talks about iOS 7, and what it will look like under Jony Ive. Scott Forstall, Apple's old VP of software who was responsible for iOS since its inception, recently left Apple and with it the development of iOS. Apple appointed Ive as the head of iOS, and iOS 7 will be the first view into his ideas for Apple's mobile operating system. The Apple design team have been provided with hardware samples much earlier in the design cycle, in order to tailor iOS to the actual handset, according to the WSJ.

In regards to the design of iOS 7, the WSJ reports that it will be "starker and simpler" with a new "flat design" ethic. Apple is aiming for "greater collaboration across hardware, software and services" in regards to the iPhone, iPad and iOS. Apple's hardware and software teams currently work very closely with each other, at Steve Jobs' request.

 WSJ: Changes to iOS 7 will be "pretty conservative"