U.S. stock futures weaken; M&A in focus By: MarketWatch October 04, 2010 at 06:16 AM EDT U.S. stock futures point south, with weaker European markets in the background and Genzyme in focus after Sanofi goes hostile with its bid. Read More >> Related Stocks: Alcoa Credit Suisse Group ADR Sanofi-Aventis S.A. ADR