The terms of the settlement haven't been released as of yet and we've requested comment from both companies. Confusing the situation even more is Gibson's recent loss in ... umm ... another case with the publisher, we suppose? Perhaps the two companies will explain.
Activision remains engaged on another music/rhythm game front with Genius Products ... via 7 Studios, its development studio, over Scratch: The Ultimate DJ. Like us, you'll just have to wait patiently until the tantalizing results of that lawsuit come to light.