At the time we were curious as to why – now one of our contacts within the world of iPod peripheral production told us the details – and it’s all in Firewire…
"The recently launched iPod nano G4 and iPod touch G2 have changed slightly from their predecessors in terms of how they charge," our contact said. "The new models will now only charge via USB, whereas previous iPods also charged via Firewire, both over the 30 pin connector. Because of this, for speaker docks to charge and play an iPod, they must provide charge over USB."
"This is important as many major brands followed the Firewire technology route and so their speaker docks will not charge the new iPods."
So there it is, just a quick detail to clarify things.