I got mine too. I know that it's just a reminder email but at least it confirms that I will get a chance to try the website early. I was so excited to see the email. Now all that is left is the final welcome email. It's definitely getting closer. I'm so excited.
BTW to NemeshT who asked whether the sign in button is there, according to the website where the Pottermore link in my email took me to, it has been removed temporarily.
Best of luck to everyone!!