Aukey has announced that its new 100 watt (W) charger with a USB type C port is now available to pre-order. This Omnia 100W is based on gallium nitride (GaN) technology, which leaves it with a depth of 32 millimeters. This, according to the OEM at least, makes it more portable than a comparable MacBook Pro power-brick.
https://www.notebookcheck.net/Aukey-releases-its-latest-100W-USB-type-C-charger.462185.0.html
It seems to be intended for use by daisychaining other devices to the laptop this charges, otherwise nobody could live on a single C port. Prolonged use like this could damage the laptop's battery though.
Very timely. I have been waiting for my HyperJuice, which I ordered after reading about here, since the beginning of February. I think it may have arrived at my mailbox a couple hours ago.