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Firstly, behavior of the --zookeeper command line parameter will change. After this change it will print a warning message saying its ignored. Therefore every user will need to change --zookeeper to --bootstrap-servers, --adminclient-property or --adminclient.config. 

Secondly, users as of this KIP would be able to describe all topics or brokers in one step but can't do it for clients and users. For those who have this use case will still need to use the old command for a while (see below). The reason for this change is currently MetadataRequest provides enough information about topics and brokers so it's possible to describe all of them in one step but there's no such information about clients and users.

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