Jo has updated her site with an announcement of her plans for July 21st! Tickets for a massive booksigning event will be distributed through her English-language publishers:
She has really focused this book launch on the fans. In her words, “It has been a long time since I’ve done a signing and had the chance to speak to readers individually, so I’m delighted that we are launching the book in this way. It will be wonderful for me to get the chance to speak to people who have already read a few chapters while in the queue!”
Edit: As far as the publisher restrictions, please take a deep breath and remember what it was like in 1999 and 2000 when Jo would try to make author appearances and far more people would show up than the event could handle. For example, on a tour of England on the Hogwarts Express so many people showed up at at least one of the stops that Jo was not allowed to get out of the train. Imagine what it was like for her to have to watch her tearful fans from inside the train. There’s just Jo, and there is aaaallll of us. I don’t have any inside information on this, but I can’t fault her publishers for trying to set limits.