Too many colours. Of course I'm thinking from a reseller's perspective here. Can't order less than 15 of a specific colour. So how should I test whether people actually _want_ a yellow 8 GB but not a purple 16 GB? Too many freakin' colours. They make a nice picture assembled for marketing purposes, but I see a bit of a problem for myself. Silver and black: Of course. Orange, green and blue: Yes, yes, yes. The others I can go without. Sure, the red one. But we can't sell those, can we now... 
Other than this colour-hell for resellers, I'd say that new nano is going to be the biggest iPod nano success yet.

Other than this colour-hell for resellers, I'd say that new nano is going to be the biggest iPod nano success yet.