The Disney Wish will have 4 entertainment venues onboard. They will be called the Walt Disney Theatre, Grand Hall Stage, Luna and Hero Zone. Disney also said that there will be fireworks on the Disney wish too.
Walt Disney Theatre:

The Walt Disney Theatre will be homed to many broadway style shows. Disney did announce that Disney’s Aladdin the Musical Spectacular will be coming to the Walt Disney Theatre and Disney has said that it will be upgraded and better than ever. There are also 2 brand new broadway style show’s in development that Disney announced today.
Grand Hall Stage:

Located in the atrium at the heart of the ship guests will be able to experience fun surprises throughout the day.