US Stocks Seen Lower; ECB Eyed By: CNBC.com News May 02, 2013 at 05:20 AM EDT U.S. stock index futures signaled a lower open on Thursday, as weak manufacturing data knocked investor confidence in Asia and Europe. Read More >> Related Stocks: Barrick Gold Corp Cigna Corp Estee Lauder Co General Motors Kellogg Co Sanofi-Aventis S.A. ADR