The new iPad Pro 11 and iPad Pro 12.9 (2018) came with a brand new Pencil that that is incompatible with older tablets. Part of that is the new wireless charging system that replaces the Lightning connector of the first generation pencils.
Whats interesting about this wireless system is that it is incompatible with Qi charging. Thats even though Apple uses Qi on the iPhone, Apple Watch and even the AirPods.
The second generation Pencil has two magnet arrays (Halbach array), one on either side of the charging coil, they line up with the magnet arrays on the iPad. This way the charging coils are always perfectly arranged for optimal charging.
Anyway, the new iPad Pro duo takes one step forward and one step back a standard wired charging port (USB-C) and a proprietary wireless charging system.