There could be good news coming for one side of a war tearing Wall Street apart (NDAQ)

Trading firms have long complained about the mounting cost of data charged by US exchanges like the New York Stock Exchange and Nasdaq. The Securities and Exchange Commission's appointment of Brett Redfearn, a trading veteran and critic of the way exchanges sell data, may signal change is on the way.    Wall Street has been embroiled in a civil war between traders and exchanges over the rising cost of market data, and a recent hire by the Securities and Exchange Commission is being...