Disney will be resting a major change to the FastPass+ system next week, specifically how the FastPass selection are made.
WDWMagic reports that the test, due to take place at Disney's Hollywood Studios will limit the number of FastPass+ selections into two groups:
Based on this, it'll mean that you wont, for example be able to get a FastPass for both Fantasmic! and Toy Story Mania at the same time. A similar system is expected to be tested at Epcot next, with Magic Kingdom and Animal Kingdom following once they roll out a 2-group system.