As one of the Kickstarter backers I got a Scarab miniSpartan6+ board and decided to try out the Audio output. It's pretty basic, just adding a low-pass filter on the Spartan6 pins (no audio CODEC) and running to a standard earphone jack.
Here's a project in case there are others here that want to try it out.
There is a ReadMe file in the zip that explains how to program the bit file to the board. You may need to download the utility for this if you haven't already done so. Links are provided if you need to.