I met with the Zune folks today and one bit of information than I can discuss immediately is that the Zune HD will be the only device type going forward: The current Zune models, the Zune 8, 16 80, and 120, have all been discontinued. So if you want a classic Zune device, buy it now, as they'll only be around while supplies last. The Zune HD goes on sale September 15 in 16 GB and 32 GB variants.
One other Zune tip: While you can preorder the Zune HD right now from a handful of electronic retailers, your choices are somewhat limited. In pre-order form, you can only get a black body style by getting the Zune HD 16 GB. And if you preorder the 32 GB version, you can only get it in platinum. But if you wait until September 15, you can choose either color in either capacity, and if you order on Zune Originals, you'll be able to customize your device further with other colors and etchings.