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1. The output of --describe will change to return one row per topic partition in the group. This means that group members with no assigned partition will not be present in the default output.
2. A new switch --members will be introduced, that can only be provided along with --describe, to return a list of all active members of the group. For each member the number of assigned topic partitions (without any offset information) and the assignment strategy used by the member are also returned. Additional information (such as member subscription and assignment) can also be provided with a --members --verbose option.
3. A new switch --offsets will be introduced, that can only be provided along with --describe, that returns the same default output of --describe. I.e., this will be the default switch that can be additionally used with --describe.
4. A new switch --state will be introduced, that can only be provided along with --describe, to return group-level status information that is returned from the DescribeGroups API call.

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Note that consumers without any assigned partitions will no longer appear in the listing.

--describe --members and --describe --members --verbose

A new option --members is introduced that is allowed with --describe only and returns info about active members of the group along with their assigned topic partitions:

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