Just because by this stage rumours generally seem to be pretty accurate - I remember saying the iPhone 5 design rumours were false because the camera didn't sit parallel to the corner radius like in the iPhone 4 and that it sat too far down in the glass panel rather than central - something Apple would "never do" in my own words. I was wrong. They are getting sloppier with their design so I expect this is real, thin is now more important than any other factor - I do hope any protruding lens is factored into measurements if that's the case otherwise it's a false measurement! 😛
They have gotten sloppy and it is obvious. With the 5, I felt that the antennae windows would necessarily align with the breaks/spacers on the side and horizontal lines of the front--I was wrong. The leaked design of the iPhone 6 continues the trend towards design by committee that's been prevalent since Jobs left. The leaked version is definitely "good enough" and even Jobs made some concessions--I'm sure they tell themselves.
Jobs turned out amazing products, but he was very hard man to work for. The current Apple leadership team are almost certainly better people to work for, and Apple certainly is still raking in the money while continuing to turn out a premium phone. Apparently, the flat and rounded design was insisted upon and everything else made to fit...until the optics team won a concession after convincing people that further shrinking wasn't currently possible (and they're probably right).
I'm sure the iPhone 6 will be a fine phone. It will probably be the best Apple has made yet. But, with all the concessions made, they're increasingly turning out bland and boring products. They don't take risks, like they used to. Jobs was an artist, albeit in a medium that is still largely unappreciated and misunderstood, and they just don't have that unified and distinct vision any longer.
So, since Apple is now just another electronics mega corp, I wish they would stop pretending they can fake the old mojo and work on what's really important. The first thing is probably battery life, for all of these devices...why can't we get a few days or a week out of a phone before recharge?....we ought to, and we will eventually, why not now? Waterproofing/ruggedizing---why isn't this insisted upon, since the technology is even available to consumers at retail this very moment? Why are we still having to worry about running out of space on our devices? iCloud could and should fix that, but the paltry 5gb is makes storing backups even difficult--if Google can offer 15gbs what's stopping Apple?