The Zune 80 GB will initially only be available in Black (what! no Brown!!) and is a hard drive model.

Hardware Differences from the Zune 30:

27% Smaller: 4.26 x 2.41 x 0.51 (from 4.43 x 2.47 x 0.65)
14 % Larger Screen: 3.2 inches (from 3.0 inches)
20% Lighter: 4.5oz (from 5.6oz)

Zune Software Features that all Zunes will have (including the existing 30GB Zune via firmware update):

• Wireless sync: wirelessly updates content on the device when it is within range of the PC with the Zune Collection on it, or on the same wireless network.
• Expanded wireless send capabilities. You can now keep a track for three plays and send a track you have been sent, to other Zune owners.
• Lossless playback will be supported on every Zune
• Podcasting – that is, automatic RSS based subscription to both audio and video podcasts via Zune Marketplace.
• You Will be able to sync your Vista Media Center TV content to your Zune and watch it on the go.
• Updated device UI.