Epic Universe opens on May 22 next year. Disney and smaller rivals will be ready.Theme park fans know that the battleground is set in central Florida next year. Walt Disney's (DIS -0.62%) top rival is opening a fresh gated attraction next year, the first major theme park introduced in this country in 25 years. Comcast's (CMCSA -2.65%) Epic Universe -- just outside of the current Universal Orlando resort -- will turn heads with richly themed areas dedicated to popular franchises. Now we know exactly when tho ...