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

core/themes/classy/templates/field/field--comment.html.twig

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+{#
+/**
+ * @file
+ * Theme override for comment fields.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - label_hidden: Whether to show the field label or not.
+ * - title_attributes: HTML attributes for the title.
+ * - label: The label for the field.
+ * - title_prefix: Additional output populated by modules, intended to be
+ *   displayed in front of the main title tag that appears in the template.
+ * - title_suffix: Additional title output populated by modules, intended to
+ *   be displayed after the main title tag that appears in the template.
+ * - comments: List of comments rendered through comment.html.twig.
+ * - content_attributes: HTML attributes for the form title.
+ * - comment_form: The 'Add new comment' form.
+ * - comment_display_mode: Is the comments are threaded.
+ * - comment_type: The comment type bundle ID for the comment field.
+ * - entity_type: The entity type to which the field belongs.
+ * - field_name: The name of the field.
+ * - field_type: The type of the field.
+ * - label_display: The display settings for the label.
+ *
+ * @see template_preprocess_field()
+ * @see comment_preprocess_field()
+ */
+#}
+{% set field_name_class = field_name|clean_class %}
+{%
+  set classes = [
+    'field',
+    'field-' ~ entity_type|clean_class ~ '--' ~ field_name_class,
+    'field-name-' ~ field_name_class,
+    'field-type-' ~ field_type|clean_class,
+    'field-label-' ~ label_display,
+    label_display == 'inline' ? 'clearfix',
+    'comment-wrapper',
+  ]
+%}
+{%
+  set title_classes = [
+    'title',
+    label_display == 'visually_hidden' ? 'visually-hidden',
+  ]
+%}
+<section{{ attributes.addClass(classes) }}>
+  {% if comments and not label_hidden %}
+    {{ title_prefix }}
+    <h2{{ title_attributes.addClass(title_classes) }}>{{ label }}</h2>
+    {{ title_suffix }}
+  {% endif %}
+
+  {{ comments }}
+
+  {% if comment_form %}
+    <h2{{ content_attributes.addClass('title', 'comment-form__title') }}>{{ 'Add new comment'|t }}</h2>
+    {{ comment_form }}
+  {% endif %}
+
+</section>