Per WDW News: Starting April 10th, a series of very important upgrades will be made to your FastPass+ experience at Walt Disney World.
After booking their initial 1-to-3 FastPass+ reservations (you will now have the option to book anywhere between one and three, not forced to pick 3 initially), guests will now be able to book an additional and even further FP+ reservations through the MyDisneyExperience app. These can be made one at a time, so once you finish your initial reservations that were made in advance, then you may book another. With every additional FP+, you are able to just book one at a time and only book another once the previous are completed (as the system works now, but you will be able to book additional FastPass+ yourself through the mobile app or website, and book for another park if you plan to switch).
With the upgraded system, guests will be able to choose an attraction and time for the attraction simultaneously, instead of simply hoping that a time they wanted would be suggested after making their three initial attraction choices. This should allow guests to better customize their daily plans to their liking.
Other new features include the ability to remove individual guests from a FastPass+ reservation and the ability to cancel a single FastPass+ attraction reservation instead of all of them.
With these changes implemented, the Quick Picks FP+ option will be removed.
Guests will see significant changes to the look of the app (and kiosk interface) on April 10th, 2016, but larger changes that will make the app look and function more like the new official Disneyland Resort app are still expected at a later date.