Details are still scarce, but according to their sources Amazon is planning to open a local site in September or October. Tweakers is also reporting that Amazon had already started hiring a Dutch marketing team last year, though this has yet to be confirmed by any job postings.
There also is no news on whether Amazon has started leasing or building local distribution centers, but here is speculation that shipping might be handled out of Amazon's Germany, France, or other European operations.
The big question here, and this is the one I've been bugging my sources about, is whether the imminent launch includes a local Kindle Store. In the long run, this is almost a certainty. But in the short run there's no guarantee that the Kind;e Store will go live at the same time (it didn't in Spain).