Well, it's official now: the Zune HD is coming out on September 15, and you can pre-order it right now at a number of online vendors. So says Microsoft in an announcement on the Zune website.
As expected, the Zune HD is launching in 16GB and 32GB capacities. The former can be pre-ordered for $219.99 at Newegg, while the latter is $289.99. The pre-orders only cover a single color for each model, though. On September 15, Microsoft says, you'll be able to grab a Zune HD in "five different colors with the option to customize your player with one of 10 new engravings designed by guest artists."
The announcement sums up the Zune HD's main features, too, including confirmation that it's powered by an Nvidia Tegra system-on-a-chip. You're also getting a 3.3" OLED touch screen, Wi-Fi, HD video output (through a separately sold docking station), HD radio support, and a full-screen web browser with multi-touch goodness.