Not sure what's going on with that interesting controller, but it looks like a real button, but is just wide enough that it may have touch-sensitive properties. These photos came from a source who cites marketing materials, likely from the retail channel, but were confirmed by a second source as well. Does that mean they're final? I don't know. If I were Microsoft, I might seed the internet with mockups as to confuse. Oh, how I love counterintelligence measures. So take them with a grain of salt, confirmed as something, but still unofficial.
Microsoft, Zune, Zune 2, Zune Flash, Screenshot