We have pre-ordered these and expect them soon! 

Extending the range of compatible lenses, the PL to RF Lens Mount Adapter from Canon is designed for attaching any ARRI PL-mount lens to the EOS RF-mount EOS C400 digital cinema camera. This sophisticated adapter mounts onto your EOS C400 and features two side locks to keep it secure on the camera’s body. It supports Cooke /i metadata to pass from your lens to your camera for a variety of digital production needs. Key features include:

• Use ARRI PL Lens on Canon RF Mount
• Includes Two Side Locking Plates
• Supports Cooke /i Metadata to Camera
• Solid, Machined Design for EOS C400