from an initial investigation this appears to be an issue with pulp.
Using the Ruby Console to monitor the 'next run':
User.current = User.first
Katello.pulp_server.resources.repository_schedule.list(Katello::Repository.first.pulp_id, 'yum_importer')
=> [{"next_run"=>"2014-09-08T22:38:00Z", "remaining_runs"=>nil, "last_updated"=>1410215387.624102, "first_run"=>"2014-08-27T00:38:00Z", "total_run_count"=>1, "schedule"=>"2014-08-27T00:38:00Z/PT1H", "kwargs"=>{"overrides"=>{}}, "args"=>["Default_Organization-asdf-asdf"], "enabled"=>true, "last_run_at"=>"2014-09-08T22:31:08Z", "task"=>"pulp.server.tasks.repository.sync_with_auto_publish", "failure_threshold"=>nil, "resource"=>"pulp:importer:Default_Organization-asdf-asdf:yum_importer", "_id"=>"540e2ddb47078714385f6656", "consecutive_failures"=>0, "_href"=>"/pulp/api/v2/repositories/Default_Organization-asdf-asdf/importers/yum_importer/schedules/sync/540e2ddb47078714385f6656/"}]
I changed it to daily and see:
=> [{"next_run"=>"2014-09-08T22:38:00Z", "remaining_runs"=>nil, "last_updated"=>1410215661.739015, "first_run"=>"2014-08-27T00:38:00Z", "total_run_count"=>1, "schedule"=>"2014-08-27T00:38:00Z/PT24H", "kwargs"=>{"overrides"=>{}}, "args"=>["Default_Organization-asdf-asdf"], "enabled"=>true, "last_run_at"=>"2014-09-08T22:31:08Z", "task"=>"pulp.server.tasks.repository.sync_with_auto_publish", "failure_threshold"=>nil, "resource"=>"pulp:importer:Default_Organization-asdf-asdf:yum_importer", "_id"=>"540e2ddb47078714385f6656", "consecutive_failures"=>0, "_href"=>"/pulp/api/v2/repositories/Default_Organization-asdf-asdf/importers/yum_importer/schedules/sync/540e2ddb47078714385f6656/"}]
So the schedule was updated which make it look like katello did the right thing and changed the repo in pulp. However even a couple hours later:
=> [{"next_run"=>"2014-09-09T01:38:00Z", "remaining_runs"=>nil, "last_updated"=>1410215661.739015, "first_run"=>"2014-08-27T00:38:00Z", "total_run_count"=>4, "schedule"=>"2014-08-27T00:38:00Z/PT24H", "kwargs"=>{"overrides"=>{}}, "args"=>["Default_Organization-asdf-asdf"], "enabled"=>true, "last_run_at"=>"2014-09-09T00:38:00Z", "task"=>"pulp.server.tasks.repository.sync_with_auto_publish", "failure_threshold"=>nil, "resource"=>"pulp:importer:Default_Organization-asdf-asdf:yum_importer", "_id"=>"540e2ddb47078714385f6656", "consecutive_failures"=>0, "_href"=>"/pulp/api/v2/repositories/Default_Organization-asdf-asdf/importers/yum_importer/schedules/sync/540e2ddb47078714385f6656/"}]
The 'next_run' field is still updating hourly. I did a quick pulp bug search and did not see anything, so i will inquire with the pulp team.
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