Can you answer Rick's three questions?
The new "thing" in order to make it past the prison gates are to answer the council's three questions:
1. How many walkers have you killed?
2. How many people have you killed?
These are now to be asked to anyone willing or interested in joining Rick's new utopia. The lingering question remains on how this will work when greater foes (a returning Governor or an evil Negan) try to make their way into this community.