This article is interesting. It says a number of things:
1. It calls the agency model "Apple's" rather than the publishers'
2. It includes a claim by Hachette that the Agency model is legal in the EU
3. It confirms Amazon's stance that it is not using this model in the UK and is seeking to be the cheapest
Presumably, Amazon's strategy is to use this to put pressure on the pricing within the agency model (and perhaps the model itself)?