I don't care about Apple's "Innovative hardware and user interface experience" and Google's so claimed "Open Operating System" (Everyone knows that this was just a buzz to get the rest of us on the boat, only to realize that it's been patched pretty much everywhere and that it's "sinking now" as we speak).
Mozilla, was (and is still) a good old player in the open source community. The fact that the OS will be based on HTML5, should make things (as mentioned above) easier for developers. One standard to follow, mobile, desktop or portable. It is time we gave the stage to those who have been waiting to provide their vision of user experience, other then the ones available by our beloved/hated industry giants.
I will cross my fingers and hope to see the OS in a mature state on it's initial lunch (unlike the release of Android).
Go Mozilla!