We've still got a while to wait until the expected iPhone model refresh in September, but that means there's also plenty of time for details to leak. The latest is news of a square camera bump expected to appear on the back of all three 2019 iPhones.

As 9To5Mac reports, news of the square bump comes via Mark Gurman on Twitter who posted an image of purported 2019 iPhone case molds. These molds are typically used by case manufacturers to design their new cases around, but ultimately a few fall through the cracks and offer us a teaser of what's to come.

Alleged next iPhone case moldings show what we discussed in our story last week in terms of new cameras. 3 on the high end, 2 on the new XR. Plus all models apparently getting a square, at least based on this one mold floating around. https://t.co/BhAFTZZL6u pic.twitter.com/QlNJTsApzX — Mark Gurman (@markgurman) May 13, 2019

The square camera bump is sure to stand out mainly because the camera layout being suggested is quite unusual. On the iPhone 11 and 11 Max there's a trio of cameras, but they are positioned in a triangular configuration with the flash and microphone positioned above and below within the square. The refreshed iPhone XR also has the square bump, but is limited to just two camera alongside the flash and microphone.

While all three are unusual layouts, they are also distinctive which is likely why Apple is happy with this design. The configuration is surely done with good reason, but for marketing purposes just showing the camera area of these phones in an image will make them instantly recognizable as iPhones.

This could be a fake mold or an early design that's since been rejected. However, until we learn otherwise this looks to be the new back of the iPhones and a major camera upgrade for Apple's smartphones.