WMExperts report that the ZuneHD has seen some minor software updates, with the Facebook client moving to version 1.1, and the twitter client to 1.2.
The changes are not appeared in the Facebook client, but the twitter app gets a landscape keyboard option under its settings, which improves typing speed.
There is also a new game, Hearts and Spaces, available in the Marketplace.
More screenshots at WMExperts here.