Zune owners have been looking forward to the next Firmware update after the last firmware update improved performance and improved stability. This next one, which we just found out is coming Mid-March, will fix a certain skipping problem users are having when playing Zune Marketplace songs.
Besides improving "device and software reliability" again, it's also going to stop the FM Tuner from draining battery while in sleep mode. These are the only three things listed for now, but who knows, they may slip in an extra bullet point or two come March.
Zune Firmware Update 1.3 - Coming Mid-March. Skipping Fixed. [Zune Insider]