Source code for a new fuzzer that, according to its developers, vastly outperforms everything existing to date has just been released: https://github.com/AngoraFuzzer/Angora
It is written at least partially in Rust. Uses LLVM 4.0 so probably can't instrument Rust code just yet.
If you want to claim some CVEs and bug bounties to your name, this is your chance. I did it back when AFL dropped, and I'm kind of bored of that already.
I found the claims about how effective it is very difficult to follow -- specifically I couldn't tell if all the findings were against LAVA injected vulnerabilities, or if it found things in real programs.