$$$ U.S. Preparing Charges Against Banks in Currency Rate-Rigging Cases [Bloomberg] $$$ Citigroup, E*Trade Said to Be Breached by JPM Hackers [Bloomberg] $$$ More Big Venture-Backed Companies Shun IPOs, For Now [WSJ] $$$ Banks Set to Sign Deal Helping End ‘Too Big to Fail’ [WSJ] $$$ Expensive engagement rings mean shorter marriages: study [NYDN] $$$…