From another Blog site :
D23 weekend, starting July 14, is the target for having Fantasmic, Tom Sawyer Island, and the steam trains back on line. The river has been refilled and Fantasmic is already in rehearsals, so the island and the nighttime spectacular shouldn’t have any trouble meeting that deadline. But one source said if the railroad somehow meets that date, it might mean initially operating just one train. “They don’t know how the test will go for the trains and its new ride control system,” one employee explained.