It also doesn't appear that either of these are as small/thin as the nano. I just saw one yesterday and it still blew my mind; that thing is small! Plus, the longer these other guys wait, the harder it will be to catch the iPod. They're going to need to dedicate a deliberate plan of attack. Right now there aren't any mp3 players that really distinguish themselves from even their own pack, never mind the iPod.
EDIT: Well maybe the size is close. I still don't think it matters.