Paul Morris, writing for Redmond Pie:

One extremely interesting tweak comes in the form of an updated Wi-Fi Assist feature that now shows granular usage of data when called into action.

Apple’s changes to Wi-Fi Assist as introduced with iOS 9.3 beta 1 means that users can actually see exactly how much data the feature has utilized as part of its services. The Wi-Fi Assist option has been updated to include a small label underneath the main header to show an approximate amount of data that has been chewed through in MBs.

Great addition.