Engadget has some rumoring going on that Microsoft has a big Zune announcement today that is probably an "entirely new Zune".
At this point I would be happy just to hear that we are finally getting Podcast support.
New Zune at Microsoft event on Monday?
Update 5/8/2007: I can't find any information on the web today about any announcement other than some new TV commercials that started airing yesterday. So I guess this rumor is a flop.
Update 5/9/2007: Okay, so now it looks like some people did get to see a new Zune, but Microsoft is being quiet about it. Maybe still just a rumor.