Now it' 1 PM here in france (Paris), zune.net has just been up. Zune software was updated first followed by Zune firmware when the device was connected.
It took three minutes, no error message, all done

. Zune look changed but I haven't noticed yet any video/audio quality enhancement, one thing changed : I used dSHARPiE to organize my videos based on tvshow tag (for example, all seinfeld episodes to have the same tvshow tag seinfeld), this doesn't work any more

because under tvshows, all episodes are shown instead of the tag seinfeld itself.