Also, for those people wanting bluetooth, you better hope they much better improve the nano's battery.
For very small power draws it does last a long time, but it seems any tiny increase in power draw really affects battery (on headphones it does last hours and hours. But just put it to my helmet's speakers, which really don't get that loud as they don't need to since they are in my helmet and right next to my hears, the battery gets sucked out in 2 hours or less, especially if it is cold). And I know it's not mine, I already returned and replaced it once and it maybe was a little better the 2nd time around (and then I just figured it was a design issue).
I'd hope they better the battery before they even put an external speaker in it (That will really suck its battery too).
So yeah, the nano as is is not ready for bluetooth or external speakers or anything that draws more than just a small amount of power. Until they find a way to get a better battery in that small space (I think they can claim 24 hours cause with headphones the thing doesn't need much power at all.. it's not that the battery is good, it's just that it doesn't need much power. put something on it that needs power and that battery will be drained like that).