The two new optional arguments that are added to the psadmin merge-display-profile are:
--community-namel-e community_name
--community-dp-names-E community_dp_names
In Portal Server 7.2, you can add these options in the existing patterns of psadmin subcommand. The options are passed to the DPAMerge class, which is the workhouse of the psadmin merge-display-profile subcommand.