In January, over 500 Hong Kong Disneyland Cast Members arrived at WDW for 6 months of learning and training.

The Hong Kong Disneyland Preview Center opened in April at Epcot's China Pavilion.

The Kingdom of Dreams sign is outdoors, above the entrance to the museum section of China, now the preview center.
 
Full-wall mural which greets you when you walk in the door. It's the view you'd see standing on the at the train station looking up Main Street.
 
"Disney's Hollywood Hotel -- This 8 story, 600 room hotel possesses an Art Deco architecture style with whimsical Mickey Mouse inspired motifs, an elegant design that captures all the glitz and glamour of Hollywood's Golden Age. Perhaps the most distinctive feature of the resort is an elaborate outdoor courtyard, the centerpiece of which is a piano-shaped pool."
 
Mickey surfing on the whale is part of the fountain (see picture behind the whale)
 
The costumes are specifically those of the Hong Kong Disneyland ambassador,and that's her picture in the background. The darker costume is more formal. 

"A Pop-Up Park -- This "Fun Map" of Hong Kong's Magic Kingdom is inspired by the very first Disneyland souvenir map, which imagineering legend Sam McKim drew at Walt Disney's request in 1958. On opening day, Hong Kong Disneyland will feature four theme lands, including Main Street U.S.A., Adventureland, Fantasyland and Tomorrowland."

Orbitron - Dumbo-like attraction
 
Animals for the Jungle Cruise Attraction
 
"Tarzan's Treehouse -- Unlike the landlocked original at Disneyland in California, Hong Kong's version of Tarzan's Treehouse occupies a lush island in the middle of a jungle river. Since Hong Kong Disneyland on opening day will not feature a Frontierland - or that land's Rivers of America - Imagineers had to create a new island getaway for kids in place of Tom Sawyer Island. They found their solution in another classic character from American literature - Tarzan."
 
Information taken directly from the placards in the preview center.