updated 03/25/2010 AT 2:45 PM ET
•originally published 03/25/2010 AT 4:50 PM ET
Muggles will be finally be permitted into Universal Orlando Resort’s Wizarding World of Harry Potter on June 18 – but a certain Potter mogul won’t be setting foot in the Florida amusement center until mid-summer, a source at Universal tells PEOPLE.
Still, Harry creator J.K. Rowling’s presence has been integral in the creation of the 20-acre theme park since Day One. Her approvals – along with those from Warner Bros., which produces the Potter movie franchise – were not only necessarily for the look and feel of the land, but also for the taste – of the trademark Butterbeer at the theme park’s Three Broomsticks Restaurant & Hog’s Head Pub, that is. According to a source close to the brewer, the potion is a lot like cream soda spiked with butterscotch.