title: Order WP_Query by meta and post date
body: <p>I'm currently working on a small blog which has a sidebar that displays all "special projects".</p>
  
  <p>"Special projects" is just a category, the sidebar will only display 4 posts at a time which are filtered by post date, but I also have a custom meta box to allow the user to feature posts.
  These featured post should show up on the top of the special projects.</p>
  
  <p>Right now my query is like this:</p>
  
  <pre><code>new WP_Query("showposts=" . $instance['num'] . "&amp;cat=" . $instance["cat"] . "&amp;order=ASC&amp;order_by=date")
  </code></pre>
  
  <p>And I can get the featured meta data like this:</p>
  
  <pre><code> $featured = get_post_meta($single_cat_post-&gt;ID, 'soy_featured_post', true);
  </code></pre>
  
  <p>But how could I integrate this inside the WP_Query?</p>