Microsoft plans to discontinue all older Zune personal media players when the Zune HD arrives on September 15:
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.
Microsoft will continue to support the older Zune versions with software updates. Speaking of which, there will be a new version of the Zune software (Zune 4.0) released with the Zune HD on September 15. No details have been released but it is expected to support high definition video and a Zune applications store for the Zune HD at least. By all early accounts the Zune HD is a nice player, but the real question is whether nice will cut it when it goes up against Apple’s iPod juggernaut.