diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index d311c10ddf..641625a8ec 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -618,6 +618,7 @@ phutil_register_library_map(array(
     'ManiphestDefaultTaskExtensions' => 'applications/maniphest/extensions/ManiphestDefaultTaskExtensions.php',
     'ManiphestEdgeEventListener' => 'applications/maniphest/event/ManiphestEdgeEventListener.php',
     'ManiphestExportController' => 'applications/maniphest/controller/ManiphestExportController.php',
+    'ManiphestHovercardEventListener' => 'applications/maniphest/event/ManiphestHovercardEventListener.php',
     'ManiphestPeopleMenuEventListener' => 'applications/maniphest/event/ManiphestPeopleMenuEventListener.php',
     'ManiphestRemarkupRule' => 'applications/maniphest/remarkup/ManiphestRemarkupRule.php',
     'ManiphestReplyHandler' => 'applications/maniphest/ManiphestReplyHandler.php',
@@ -2289,6 +2290,7 @@ phutil_register_library_map(array(
     'ManiphestDefaultTaskExtensions' => 'ManiphestTaskExtensions',
     'ManiphestEdgeEventListener' => 'PhutilEventListener',
     'ManiphestExportController' => 'ManiphestController',
+    'ManiphestHovercardEventListener' => 'PhutilEventListener',
     'ManiphestPeopleMenuEventListener' => 'PhutilEventListener',
     'ManiphestRemarkupRule' => 'PhabricatorRemarkupRuleObject',
     'ManiphestReplyHandler' => 'PhabricatorMailReplyHandler',
diff --git a/src/applications/maniphest/application/PhabricatorApplicationManiphest.php b/src/applications/maniphest/application/PhabricatorApplicationManiphest.php
index 038ec46bf4..7d1e1d7e4f 100644
--- a/src/applications/maniphest/application/PhabricatorApplicationManiphest.php
+++ b/src/applications/maniphest/application/PhabricatorApplicationManiphest.php
@@ -39,6 +39,7 @@ final class PhabricatorApplicationManiphest extends PhabricatorApplication {
   public function getEventListeners() {
     return array(
       new ManiphestPeopleMenuEventListener(),
+      new ManiphestHovercardEventListener(),
     );
   }
 
diff --git a/src/applications/maniphest/event/ManiphestHovercardEventListener.php b/src/applications/maniphest/event/ManiphestHovercardEventListener.php
new file mode 100644
index 0000000000..48a1bc9015
--- /dev/null
+++ b/src/applications/maniphest/event/ManiphestHovercardEventListener.php
@@ -0,0 +1,117 @@
+<?php
+
+final class ManiphestHovercardEventListener extends PhutilEventListener {
+
+  public function register() {
+    $this->listen(PhabricatorEventType::TYPE_UI_DIDRENDERHOVERCARD);
+  }
+
+  public function handleEvent(PhutilEvent $event) {
+    switch ($event->getType()) {
+      case PhabricatorEventType::TYPE_UI_DIDRENDERHOVERCARD:
+        $this->handleHovercardEvent($event);
+      break;
+    }
+  }
+
+  private function handleHovercardEvent(PhutilEvent $event) {
+    $viewer = $event->getUser();
+    $hovercard = $event->getValue('hovercard');
+    $handle = $event->getValue('handle');
+    $phid = $handle->getPHID();
+    $task = $event->getValue('object');
+
+    if (!($task instanceof ManiphestTask)) {
+      return;
+    }
+
+    // Fun with "Unbeta Pholio", hua hua
+    $e_dep_on = PhabricatorEdgeConfig::TYPE_TASK_DEPENDS_ON_TASK;
+    $e_dep_by = PhabricatorEdgeConfig::TYPE_TASK_DEPENDED_ON_BY_TASK;
+
+    $edge_query = id(new PhabricatorEdgeQuery())
+      ->withSourcePHIDs(array($phid))
+      ->withEdgeTypes(
+        array(
+          $e_dep_on,
+          $e_dep_by,
+        ));
+    $edges = idx($edge_query->execute(), $phid);
+    $edge_phids = $edge_query->getDestinationPHIDs();
+
+    $owner_phid = $task->getOwnerPHID();
+    $project_phids = $task->getProjectPHIDs();
+
+    $phids = array_filter(array_merge(
+      array($owner_phid),
+      $edge_phids,
+      $project_phids));
+
+    $viewer_handles = $this->loadHandles($phids, $viewer);
+
+    $hovercard->setTitle(pht('T%d', $task->getID()))
+      ->setDetail($task->getTitle());
+
+    $owner = phutil_tag('em', array(), pht('None'));
+    if ($owner_phid) {
+      $owner = $viewer_handles[$owner_phid]->renderLink();
+    }
+
+    $hovercard->addField(pht('Assigned to'), $owner);
+    if ($project_phids) {
+      $hovercard->addField(pht('Projects'),
+        $this->renderHandlesForPHIDs($project_phids, $viewer_handles));
+    }
+
+    if ($edge_phids) {
+      $edge_types = array(
+        PhabricatorEdgeConfig::TYPE_TASK_DEPENDED_ON_BY_TASK
+          => pht('Dependent Tasks'),
+        PhabricatorEdgeConfig::TYPE_TASK_DEPENDS_ON_TASK
+          => pht('Depends On'),
+      );
+
+      $max_count = 6;
+      foreach ($edge_types as $edge_type => $edge_name) {
+        if ($edges[$edge_type]) {
+          // TODO: This can be made more sophisticated. We still load all
+          // edges into memory. Only load the ones we need.
+          $edge_overflow = array();
+          if (count($edges[$edge_type]) > $max_count) {
+            $edges[$edge_type] = array_slice($edges[$edge_type], 0, 6, true);
+            $edge_overflow = ', ...';
+          }
+
+          $hovercard->addField(
+            $edge_name,
+            $this->renderHandlesForPHIDs(
+              array_keys($edges[$edge_type]),
+              $viewer_handles)
+                ->appendHTML($edge_overflow));
+        }
+      }
+    }
+
+    $hovercard->addTag(ManiphestView::renderTagForTask($task));
+
+    $event->setValue('hovercard', $hovercard);
+  }
+
+  protected function loadHandles(array $phids, $viewer) {
+    return id(new PhabricatorObjectHandleData($phids))
+      ->setViewer($viewer)
+      ->loadHandles();
+  }
+
+  protected function renderHandlesForPHIDs(array $phids,
+    array $handles, $glue = ', ') {
+
+    $items = array();
+    foreach ($phids as $phid) {
+      $items[] = $handles[$phid]->renderLink();
+    }
+
+    return phutil_implode_html($glue, $items);
+  }
+
+}
diff --git a/src/infrastructure/events/constant/PhabricatorEventType.php b/src/infrastructure/events/constant/PhabricatorEventType.php
index 6ccc84dd37..20e7b688ad 100644
--- a/src/infrastructure/events/constant/PhabricatorEventType.php
+++ b/src/infrastructure/events/constant/PhabricatorEventType.php
@@ -31,5 +31,7 @@ final class PhabricatorEventType extends PhutilEventType {
   const TYPE_UI_DIDRENDEROBJECTS            = 'ui.didRenderObjects';
   const TYPE_UI_WILLRENDERPROPERTIES        = 'ui.willRenderProperties';
 
+  const TYPE_UI_DIDRENDERHOVERCARD          = 'ui.didRenderHovercard';
+
   const TYPE_PEOPLE_DIDRENDERMENU           = 'people.didRenderMenu';
 }