The new library is currently available in the Arduino Library Manager and a release will be made very soon to include AVR devices in addition to the Arduino Due.
The intent is to allow easier creation of audio applications on all Arduino devices by providing a subset of functions to drive the DAC (or PWM), ADC, TIMERS and DMA (if available) in a very simple way.
The library has been designed with wireless applications in mind, and provides/will provide automatic synchronization between devices by managing the timers on more capable devices like the Due or better.
A number of examples have been provided including wireless transmission & reception of audio over capable radio devices, (nrf24l01+ used in examples) as well as playback and recording from SD card.
I will be adapting my current libraries, RF24Audio and TMRpcm to utilize this baseline audio library to provide the same or better functionality on as many Arduino devices as possible, but for now only the Due and AVR (Uno, Nano, Mega, etc) device support has been added to this library. They currently support WAV audio playback direct from SD card along with wireless transmission, reception, recording, etc...
Any issues, requests for features etc can be posted on GitHub and feel free to ask questions or provide input here, for anybody that wants to try it out.