gevent I/O backend
A gevent I/O backend is probably desirable. However, gevent for Python 3 is in a state best described as "not ready," and the gevent maintainer's opinion on Python 3 is rather... well, low. Don't hold your breath on working mainlined Python 3 support in gevent. You'll turn blue and pass away.
The socket backend probably works with monkey patching, but a more "native" one using green threads and gevent's scheduler is probably more ideal.
In the meantime @fantix's fork is probably the best option if anyone wants this.