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

core/modules/forum/templates/forum-icon.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation to display a status icon for a forum post.
+ *
+ * Available variables:
+ * - attributes: HTML attributes to be applied to the wrapper element.
+ *   - class: HTML classes that determine which icon to display. May be one of
+ *     'hot', 'hot-new', 'new', 'default', 'closed', or 'sticky'.
+ *   - title: Text alternative for the forum icon.
+ * - icon_title: Text alternative for the forum icon, same as above.
+ * - new_posts: '1' when this topic contains new posts, otherwise '0'.
+ * - first_new: '1' when this is the first topic with new posts, otherwise '0'.
+ * - icon_status: Indicates which status icon should be used.
+ *
+ * @see template_preprocess_forum_icon()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes }}>
+  {% if first_new -%}
+    <a id="new"></a>
+  {%- endif %}
+  <span class="visually-hidden">{{ icon_title }}</span>
+</div>

core/modules/forum/templates/forum-list.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation to display a list of forums and containers.
+ *
+ * Available variables:
+ * - forums: A collection of forums and containers to display. It is keyed to
+ *   the numeric IDs of all child forums and containers. Each forum in forums
+ *   contains:
+ *   - is_container: A flag indicating if the forum can contain other
+ *     forums. Otherwise, the forum can only contain topics.
+ *   - depth: How deep the forum is in the current hierarchy.
+ *   - zebra: 'even' or 'odd', used for row class.
+ *   - icon_class: 'default' or 'new', used for forum icon class.
+ *   - icon_title: Text alternative for the forum icon.
+ *   - name: The name of the forum.
+ *   - link: The URL to link to this forum.
+ *   - description: The description field for the forum, containing:
+ *     - value: The descriptive text for the forum.
+ *   - new_topics: A flag indicating if the forum contains unread posts.
+ *   - new_url: A URL to the forum's unread posts.
+ *   - new_text: Text for the above URL, which tells how many new posts.
+ *   - old_topics: A count of posts that have already been read.
+ *   - num_posts: The total number of posts in the forum.
+ *   - last_reply: Text representing the last time a forum was posted or
+ *     commented in.
+ * - forum_id: Forum ID for the current forum. Parent to all items within the
+ *   forums array.
+ *
+ * @see template_preprocess_forum_list()
+ *
+ * @ingroup themeable
+ */
+#}
+<table>
+  <thead>
+    <tr>
+      <th>{{ 'Forum'|t }}</th>
+      <th>{{ 'Topics'|t }}</th>
+      <th>{{ 'Posts'|t }}</th>
+      <th>{{ 'Last post'|t }}</th>
+    </tr>
+  </thead>
+  <tbody>
+  {% for child_id, forum in forums %}
+    <tr>
+      <td{% if forum.is_container == true %} colspan="4"{% endif %}>
+        {#
+          Enclose the contents of this cell with X divs, where X is the
+          depth this forum resides at. This will allow us to use CSS
+          left-margin for indenting.
+        #}
+        {% for i in 1..forum.depth if forum.depth > 0 %}<div class="indent">{% endfor %}
+          <div title="{{ forum.icon_title }}">
+            <span class="visually-hidden">{{ forum.icon_title }}</span>
+          </div>
+          <div><a href="{{ forum.link }}">{{ forum.label }}</a></div>
+          {% if forum.description.value %}
+            <div>{{ forum.description.value }}</div>
+          {% endif %}
+        {% for i in 1..forum.depth if forum.depth > 0 %}</div>{% endfor %}
+      </td>
+      {% if forum.is_container == false %}
+        <td>
+          {{ forum.num_topics }}
+          {% if forum.new_topics == true %}
+            <br />
+            <a href="{{ forum.new_url }}">{{ forum.new_text }}</a>
+          {% endif %}
+        </td>
+        <td>{{ forum.num_posts }}</td>
+        <td>{{ forum.last_reply }}</td>
+      {% endif %}
+    </tr>
+  {% endfor %}
+  </tbody>
+</table>

core/modules/forum/templates/forum-submitted.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation for a forum post submission string.
+ *
+ * The submission string indicates when and by whom a topic was submitted.
+ *
+ * Available variables:
+ * - author: The author of the post.
+ * - time: How long ago the post was created.
+ * - topic: An object with the raw data of the post. Potentially unsafe. Be
+ *   sure to clean this data before printing.
+ *
+ * @see template_preprocess_forum_submitted()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if time %}
+  <span>{% trans %}By {{ author }} {{ time }} ago{% endtrans %}</span>
+{% else %}
+  {{ 'n/a'|t }}
+{% endif %}

core/modules/forum/templates/forums.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation to display a forum.
+ *
+ * May contain forum containers as well as forum topics.
+ *
+ * Available variables:
+ * - forums: The forums to display (as processed by forum-list.html.twig).
+ * - topics: The topics to display.
+ * - topics_pager: The topics pager.
+ * - forums_defined: A flag to indicate that the forums are configured.
+ *
+ * @see template_preprocess_forums()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if forums_defined %}
+  {{ forums }}
+  {{ topics }}
+  {{ topics_pager }}
+{% endif %}