Even on the live-stream, you could hear the developers cheering as Tim Cook and his colleagues introduced new Macs, new versions of both OS X and iOS and a new music streaming service. While none of the announcements at Apple’s World Wide Developers Conference (WWDC) are exactly “game changers” (a term Tim Cook used when talking about unspecified future products at the recent All Things D conference), taken together, the announcements show that Apple is continuing to innovate even though some of the new features in products announced today are incremental improvements.