US stock futures are down slightly Friday morning ahead of the first options expiration of 2013. We could be headed for another slow session and traders often choose to take a step back ahead of OpEx. Finance ministers and central bankers from the G20 countries are set to meet in Moscow amid rising currency tensions and there is a triumvirate of US economic data today with the Empire State Index industrial production and the University of Michigan consumer sentiment reading. Futures are climbing back to near the flat line Friday morning after being down overnight. The focus lately continues ...