Part of the patent describes doing so to cut down the number of power adapters needed to charge them all. The company also mentions having standardised connectors and cables. Which is also great news, except that the iPhone clearly still uses the Lightning cable.
While the convenience described in the patent sounds nice to have, it remains to be seen if Apple will ultimately implement the tech. The alternative currently, at least if you have a MacBook Pro, is to use it to charge your other devices with cables. But doing so will naturally rob you of all the laptop’s USB ports.