iPhone Ultra is launching this fall , and a new leak says it will feature a tech innovation that’s been over 15 years in the making within Apple: liquid metal. Apple’s first foldable iPhone, the iPhone Ultra, is just a few months away from launching. Yesterday we heard for the first time that the new model will feature a vapor chamber for cooling. The same leak mentioned Apple being on track for a September release. Now the same leaker, Fixed Focus Digital, has a new post on Weibo with another update. Here’s the post, via Google Translate: Latest confirmation: Apple has chosen a liquid metal hinge solution for its foldable screen. Furthermore, research and development and production are progressing rapidly, and prototypes have already been sent to carriers worldwide for testing. Reporting about a liquid metal hinge has been around for a while. But it’s the kind of technology that—much like foldable screens—has provided years of rumors but little substance.…