No PoC published yet, but interesting work on a new high speed router based anonymity network.

"We present HORNET, a system that enables high-speed end-to-end anonymous channels by leveraging next generation network archi-tectures. HORNET is designed as a low-latency onion routing system that operates at the network layer thus enabling a wide ra nge of applications. Our system uses only symmetric cryptography for data forwarding yet requires no per-flow state on intermediate nodes. This design enables HORNET nodes to process anonymous traffic at over 93 Gb/s. HORNET can also scale as required, adding minimal processing overhead per additional anonymous channel. We discuss design and implementation details, as well as a performance and security evaluation."

http://arxiv.org/pdf/1507.05724v1.pdf

Another subtle but slightly interesting tweak to the threat model in post-Snowden anonymity papers - increased difficultly of upholding a global political conspiracy is now explicitly mentioned as layer of defense (7.3).

R