The biggest issue with making the Audio versions is the same thing with the rest of EPU, it all depends on Gryphon's free time. Which, since he's gone back to school to finish his degree, is extremely limited. The main reason there was so much new material this summer is that he had a burst of inspiration that coincided with his summer break.
-------- Wedge Defense Force General Order 12: "Try to avoid freaking the mundanes."