I haven't heard of anything in PROD yet (there is a QUORA question on this), but I know there are several Perl shops that would jump on this when it's fully ready. You can use it today for most things (assuming hard performance isn't needed). When the optimizations and JIT are complete, you'll have a very fast OO language with optional types. My intended use cases are for pretty much anything that doesn't need a GUI like a .NET desktop app. I have a LOT of data at work and look forward to using the Grammar functionality to build useful and beautiful parsing code.
I believe Perl6 is bootstrapped by a subsection of Perl6 called NQP (not quite perl)which is written in C.