The message has changed now. It doesn't say you "may be" it says "you will" now.
Quote:
Congratulations!
You’ve successfully validated your early access Pottermore account. You will be one of the lucky few to shape the experience before the site opens to all in October.
You may have to wait a few weeks for your Welcome email to arrive as we can’t let everyone into the Beta site at the same time.
We look forward to seeing you.
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But you'll be let on in small batches.