Hi folks! So sorry for the delayed reply, I moved a few weeks ago and am still catching up!
The good news is that I have a prototype that we're testing and I hope we'll have something available to the beta testers list in the next couple of months (if you're not on the beta list, you can join here: http://eepurl.com/bPCg0D
If you have experience with Redis and/or HapiJS and would like to volunteer to help with code review, please let me know! We can offer a Wordnik t-shirt as a thank-you. :)
Unfortunately, this particular code is not likely to be open-sourced in the near future. Since the API is the core service that supports our nonprofit work, we haven't been able to figure out a way to open source our code and continue to generate the revenue we need to keep the lights on. :)
Again, thank you for your patience!