Quinn is an implementation of the QUIC protocol based on futures. It is currently in its very early stages: work is ongoing on implementing the protocol handshake for both client and server.
Quinn is the subject of a RustFest Paris (May 2018) presentation; you can also get the slides (and the animation about head-of-line blocking).
All feedback welcome. Feel free to file bugs, requests for documentation and any other feedback to the issue tracker or tweet me.