The number one pet peeve with iPhone users, however, remains its dismal battery life.
A poll of American mobile shoppers conducted by uSell.com revealed that most people want to see improved battery life in the iPhone 6 (37 per cent), followed by a bigger screen (19 per cent) and a better camera (11 per cent).
Most-wanted new features include a sapphire screen (45 per cent), infrared camera (19 per cent), and new health & fitness tools (10 per cent).
But how has each iPhone model fared in innovations over the years?
The first-generation iPhone, launched in 2007, started the ball rolling with seven innovations. The iPhone 4 stands out for having the most number of innovations, with 12.
Mobile payment methods are notably missing from the wishlist. Technology research and advisory firm Ovum said that it expects Apple to include Near Field Communication (NFC) features in its iPhone 6.
"Apple has been putting the pieces in place for a fully-fledged m-payments service for some time: Passbook, Touch ID biometrics, the iBeacon feature in iOS 7, the EasyPay feature in the Apple App Store application," says Eden Zoller, Principal Analyst, Consumer at Ovum.
"[Apple] also has 800 million iTunes accounts on file, which is a huge base to leverage for m-payments and is potentially a significant revenue opportunity."
Apple's foray into NFC could "help ignite merchant interest in NFC, that so far has remained cool due to lack of consumer uptake, " Zoller added.
Click through the gallery to make sense of the innovations throughout the years.
What future iPhone feature would you like to see the most? Let us know in the forum thread below!