The official Pottermore blog has been updated with confirmation that the early access period has begun for those who successfully completed the Magical Quill process a couple of weeks ago!
They wrote:
We’re excited to announce that early access to Pottermore has begun, so if you’re one of the million people who found The Magical Quill and registered for early access, please read the rest of this Insider post carefully.
The most important thing to know is that we need to stagger entry to the ‘Beta’ (early) version of Pottermore so we can properly collect all the feedback. To begin with, we’ll be inviting a very small number of people onto the website, so you may not receive your Welcome email straight away.
We’ll be sending those Welcome emails out over the coming weeks and, once yours arrives, you’ll be able to log in and start helping us develop the Pottermore experience.
If anyone gets access, let us know!