A Chinese blog claims to have laid hands on a new kind of charging cable developed at Apple for its upcoming 2020 iPhones. It is an upgrade on the current standard accessory in that it is braided, which is often perceived as higher-end and more durable. In addition, its Lightning-end contacts are rumored to be upgraded with new materials.
https://www.notebookcheck.net/The-iPhone-12-series-may-have-a-new-braided-charging-cable.481452.0.html