The rumor mill is churning, churning. Not too much, though, because it only squirted out a little bit of Zune HD-related info: some leaked Microsoft documents say the OLED-screened, Tegra-powered, HD-outputting next-generation media player will be coming out on September 8th. They also say there will be 16GB and 32GB versions, which seems right. The question is, will it have the value to compete with the iPod Touch?