For starters it's not definite that the next generation of iPhone will even be called the iPhone 6, despite the last model being names the iPhone 5. Apple has traditionally followed each model with a hardware upgrade but the same design - the iPhone 3GS and iPhone 4S, for example.
Now we've got the Sony Xperia Z, HTC One and Samsung Galaxy S4, eyes are firmly fixed on Apple and what it has to offer to compete. The smartphone market is much more fiercely contested between manufacturers than it used to be.
iPhone 6 release date rumours
The next-generation iPhone is probably the most confusing launch to date, with rumours flying around about various different models. Some suggest that Apple will launch multiple iPhones for the first time ever, so we could see an iPhone 5S and an iPhone 6.
There's also talk of a cheaper, budget friendly iPhone made with a plastic casing instead of aluminium - an iPhone mini perhaps.
Early rumours suggested a launch early in the year despite the iPhone 5 arriving in September. February was the marked month but it's been and gone. See also: iPhone 5S to arrive early 2013.
So, looking forward the most likely dates for an iPhone 6 announcement, with possible other iPhones, is firstly March. This is if Apple decides on a six-month cycle which is not its usual practice.Apple holds its worldwide developer conference (WWDC) annually in June and it's here that it could reveal the iPhone 6. This is the least likely as the event is focused on software. However, Apple has announced hardware at the event (last year was the MacBook Pro with Retina display) so it could use this to launch an iPhone.
If June comes and goes then September or October is the next likely time for an iPhone launch. The former would be a year after the iPhone 5 and be announced at a specific event. We say October as this was the month the iPhone 4S arrived.
The launch is very much up in the air but we'll keep you up to date with the information as and when we hear it.