Early April 2012 has been the confirmed date.
Yes, you need an email address to register on Pottermore.
Pottermore was in beta from July 2011 until April 2012. During this time nobody could register for the site. It opened on 14th April 2012.
To register, simply visit pottermore.com and click on the sign up button in the top right hand corner. Pottermore opened to the public on the 14th April 2012.
Pottermore is designed for all ages and actively encourages young children to join. To protect children you are not allowed to enter your own username. Instead, you can choose from five randomly generated names when you register. This ensures that nobody can register with an inappropriate username.
The aim is that you must find your way to pottermore. On that site you will find the magic quill, clicking that will let you register.
After the September 2015 update, Pottermore no longer has registered accounts. The site was completely redesigned and is no longer about interacting with the story. Pottemore is used more for news updates and to release new writing, it can be browsed at will.
Both the wand and sorting quizzes can only be taken once per account. You can request an account deletion and register again.
Pottermore is British. It is in the GMT timezone.
Pottermore does not have a search engine.
Pottermore is out for public release is October
Rupert Grint does not have a Pottermore account.
No. Pottermore opened to the public on 14th April 2012.