Amazon was encouraging the new customers to set up author pages (this can hep boost sales), and just to be extra helpful they included links to all 5 websites where you can currently find a Kindle Store. I have not seen the email myself, but David did share a screenshot:
I don't know about you, but I find it rather curious that there's no mention of the Kindle Stores in Italy, Spain, or Japan. While the latter could have been left out because of language issues, the other 3 sites should be listed. And even the one for Japan should be listed; for all we know the person reading the email is fluent in Japanese.
Then again, this kind of mistake (including a nonfunctional site while leaving out existing sites) strikes me as quite plausible. For all we know a memo could be circulating behind the scenes at KDP with the news that the new Kindle Store was launching in the next few days. Someone could have gotten ahead of themselves and added the link for the new site before they were supposed to.
Amazon had been rumored to be launching the Brazilian Kindle Store this month, and by my clock they have not quite 20 hours left to make that rumor come true. But today is a Friday, so it seems more likely that the launch will be announced Monday morning.