The actor was dropped from his role in the "Harry Potter" prequel after losing a high-profile "wife-beater" libel case against "The Sun" newspaper.
Fans can hear the actor read the first chapter of the series on Spotify and the Harry Potter at Home website.
The event marks the first time that many of the series' most beloved film characters have returned to the wizarding world since the eighth and final Harry Potter film was released in 2011.
The new store will feature Harry Potter and Fantastic Beasts merchandise, including exclusive products.
Warner Bros. Pictures also released a full-length trailer for the "Fantastic Beasts" sequel.
Another cast member said he would "topple the patriarchy!" with magic.
The author's spokesperson said it was a "middle-aged" moment.
Now that's a cheap trick, Warner Bros.
"But I think all the fans are aware of that," said director David Yates.
In a new story, the Harry Potter author explains how the Ilvermorny School of Witchcraft and Wizardry was founded.
Eddie Redmayne steps into the magical world of 'Harry Potter' in the fantasy spin-off.