Click the image for full-size. (Thanks Andy!)
This is the email which Amazon sent to those who have preordered the N8. If you can't read German, what it basically says is that Amazon had waited in hope of getting the N8 in a timely manner, but in the end they had to cancel all preorders. Amazon then says that they work hard to make sure their databases are up-to-date, but occasionally manufacturers make changes to their plans.
This could of course mean many things. It's possible that the N8 has been delayed only in Germany. It's also possible that Nokia is expecting so much demand for the N8 that they're limiting the number of units provided for retailers.
I'm still optimistic that the N8 will be out in August, at least in the UK.