The Zune didn't factor into Microsoft's keynote very much, but the company sends word of some interesting developments for the Zune HD in the months ahead...

This spring, the popular and intuitive Smart DJ feature that is now available on Zune PC software and Zune.net will be available on the Zune HD player. Smart DJ on the Zune HD will work by pulling music stored on the device, as well as from Zune Marketplace when connected via Wi-Fi enabled.

Zune is also allowing users to add and playback video content through other channels besides the Zune Marketplace to their device by introducing MPEG-4 part 2 Advanced Simple Profile support.

Additionally, we are working hard to deliver the Facebook for Zune HD application in the early part of the year.

Apparently, they're demoing these features at the Zune part of the Microsoft booth. I passed through there earlier today but didn't look for this, so I'll check back.