Warren Buffett and 3G Capital team up again for the merger of Heinz and Kraft Foods.  Coke and Pepsi grapple with the same problem: diet soda sales falling year over year.  Wall Street’s most powerful woman takes a job with Google.  And McDonald’s rolls out a surprising new product line.  Our analysts discuss those stories and more, plus CPA Megan Brinfield offers tax tips for investors.