Gizmodo reports that the new Zune HD will cost 220$ for the 16Gb version, and 299$ for 32Gb. That's cheaper than Sony's OLED walkman (399$ for the 32GB version, and 299$ for the 16GB version). The release date is September 8th.
This information comes from best buy's inventory system, it's not official yet. The Zune HD does appear in Amazon.com, but there's no release or price information yet.