The changes as outlined by the blog are as follows:
Guests can choose individual FastPass+ experiences and times. You can now select available experiences one by one for the times that best meet your needs for a more customized selection.
Guests are able to make one, two or three advance FastPass+ selections. You will continue to be able to make up to three FastPass+ selections in advance. However, if you’d like to be able to select just one or two, you are now able to do that, too.
Guests can make an additional FastPass+ selection via MyDisneyExperience after redeeming the first three. You are now able to make selections for an additional FastPass+ on the MyDisneyExperience mobile app, in addition to the FastPass+ kiosks located throughout the parks. Once you’ve used the fourth FastPass+ selection, you are able to select another, and so on — all on the go.