Apple is notorious for keeping leaks under control. Even in today's world where almost every detail of the upcoming Pixel phone from Google leaks, most of the rumors surrounding the next iPhone are just that: rumors.
If something does leak, it's usually ultra-rare and comes from a reliable source like Mark Gurman or...Mark Gurman. Even rarer is for Apple to leak something about its own products. That pretty much never happens...unless you're trying to open an Apple Store in time for an iPhone launch.
