Pixar Falls 4 Percent Before Bell  NEW YORK (Reuters) - Shares of Pixar Animation Studios Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=PIXR.O target=/stocks/quickinfo/fullquote"&gt;PIXR.O&lt;/A&gt; fell 4 percent before the bell on Wednesday after it  said it would postpone the theatrical release of its animated  feature "Cars" to June 2006 from November 2005.