I pretty much come from the camp of if it ain't broke, don't fix it. Or, at least, don't fix it right away until everyone else experiences all the bugs and problems :)
That being said, there is a new Zune 2.5 Software Update that you can download now.
As far as what appears to be new:
“We've updated the Zune software with features our community's been asking for, including gapless playback, smart playlists, new sorting options, multiple-device syncing, and advanced song info editing, including drag-and-drop functionality. If you have Windows Live Messenger running, it'll let your contacts know what you're playing. And when you go to Zune Marketplace, you'll now find over 800 episodes of popular TV shows to download, plus more than two million DRM-free MP3s.
Great news for members of the Zune Social: the discovery experience is now fully integrated into this update. Send messages and listening recommendations directly from the software. Zune Pass subscribers: sync your friends' Zune Cards with your device and their music comes along—their recent plays, favorite tracks, and top songs from their most-played artists[3]. Even if you don't have a Zune Pass, you'll still see their play data on your device, so you can choose what you want and buy the songs next time you sync.“
Download it here.