UPDATE: Pottermore has updated the Insider’s site update section, including a statement about the new users.
Current Pottermore users may notice some new students in the Great Hall and common rooms over the next few days. We’ve made some updates to pottermore.com in the past week, and some of our partners are helping us test these changes as we prepare to open to everyone in early April.
Just as I thought, using partner employees to test the registration process and the like before opening. POTTERMORE IS COMING!! (#PMiscoming <– use this!)
It’s amazing the things I learn on social networks. Tonight I chatted with a couple girls who were just entering Pottermore for the first time tonight, having received an early access pass to the site from their employer: Sony.