According to the leaks to which the Japanese blog Macotakara has had access and which are reflected in the image that heads the article, the next iPhone that could launch after the summer could include reverse charging, that is, it could be used to recharge other devices by induction, as if it were a wireless charging mat.
This novelty that some terminals have already included, including the Samsung Galaxy S10 in its entire range (the Korean brand calls it PowerShare) could be one of the changes in this new terminal, which, due to the images, would also maintain a design traced to the current one. In addition, he also talks about the possibility of including (finally) an 18W charger, the same one that includes the iPad Pro.
The idea that your smartphone can recharge other devices seems very attractive, although there are many doubts to clear. How long will I have to leave my iPhone face down and unused until the other device has achieved a sufficient charge? What impact will that have on my iPhone's battery, already fairly fair in capacity? Can the iPhone be used as a charger while it is charging itself? It is a characteristic that, although very impressive in promotional posters and dinners with brothers-in-law, as we understand it today, does not quite convince many. It may be that other internal changes change it enough that it is really useful on a day-to-day basis.
On the other hand, the rumor returns that Apple could include an 18W charger to recharge your device quickly, along with a USB-C to Lightning cable. This charger is the one with the lowest power capable of using the fast charge of the new iPhones., and exactly the same as the iPad Pro 2018 already uses. As it is well said, both the pitcher goes to the source ... some year they will finally include a fast charger, and it may finally be 2019.