Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/migrate/config/schema/migrate.data_types.schema.yml

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+# Basic data types for Migrate.
+
+migrate_plugin:
+  type: mapping
+  mapping:
+    plugin:
+      type: string
+      label: 'Plugin'
+
+migrate_destination:
+  type: migrate_plugin
+  label: 'Destination'
+
+migrate_source:
+  type: migrate_plugin
+  label: 'Source'
+  mapping:
+    constants:
+      type: ignore
+      label: 'Constants'
+
+# Base schema for migrate source plugins that extend
+# \Drupal\migrate\Plugin\migrate\source\SqlBase.
+migrate_source_sql:
+  type: migrate_source
+  mapping:
+    target:
+      type: string
+      label: 'The migration database target'
+
+migrate_load:
+  type: migrate_plugin
+  label: 'Load'

core/modules/migrate/config/schema/migrate.destination.schema.yml

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+# Schema for the migrate destination plugins.
+
+migrate.destination.*:
+  type: migrate_destination
+  label: 'Default destination'
+  mapping:
+    no_stub:
+      type: boolean
+      label: 'Whether stubbing is allowed.'
+      default: false
+
+migrate.destination.config:
+  type: migrate_destination
+  label: 'Config'
+  mapping:
+    config_name:
+      type: string
+      label: 'Configuration name'
+
+migrate.destination.entity:user:
+  type: migrate_destination
+  label: 'User'
+  mapping:
+    md5_passwords:
+      type: boolean
+      label: 'Passwords'
+
+migrate.destination.entity:file:
+  type: migrate_destination
+  label: 'Picture'
+  mapping:
+    source_path_property:
+      type: string
+      label: 'Source path'

core/modules/migrate/config/schema/migrate.load.schema.yml

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+# Schema for the migrate load plugins.
+
+migrate.load.*:
+  type: migrate_load
+  label: 'Default load'
+
+migrate.load.drupal_entity:
+  type: migrate_load
+  label: 'Default source'
+  mapping:
+    bundle_migration:
+      type: string
+      label: 'Bundle migration'
+
+migrate.load.d6_term_node:
+  type: migrate_load
+  label: 'Default source'
+  mapping:
+    bundle_migration:
+      type: string
+      label: 'Bundle migration'

core/modules/migrate/config/schema/migrate.schema.yml

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+# Schema for the configuration files of the Migrate module.
+
+migrate.migration.*:
+  type: config_entity
+  label: 'Migration'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    migration_tags:
+      type: sequence
+      label: 'Migration Tags'
+      sequence:
+        type: string
+        label: 'Tag'
+    label:
+      type: label
+      label: 'Label'
+    load:
+      type: migrate.load.[plugin]
+      label: 'Source'
+    source:
+      type: migrate.source.[plugin]
+      label: 'Source'
+    process:
+      type: ignore
+      label: 'Process'
+    destination:
+      type: migrate.destination.[plugin]
+      label: 'Destination'
+    migration_dependencies:
+      type: mapping
+      label: 'Dependencies'
+      mapping:
+        required:
+          type: sequence
+          label: 'Required dependencies'
+          sequence:
+            type: string
+            label: 'Dependency'
+        optional:
+          type: sequence
+          label: 'Optional dependencies'
+          sequence:
+            type: string
+            label: 'Dependency'

core/modules/migrate/config/schema/migrate.source.schema.yml

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+# Schema for the migrate source plugins.
+
+migrate.source.*:
+  type: migrate_source
+  label: 'Default source'
+
+migrate.source.empty:
+  type: migrate_source_sql
+  label: 'Empty source'
+  mapping:
+    provider:
+      type: string
+      label: 'Provider'