Retail Sales data is coming at 8:30 a.m. ET for the month of December. Empire Manufacturing data is also coming at 8:30. PPI data is expected at the same time. At 9:30 a.m. ET, Philadelphia Federal Reserve Bank President Charles Plosser will give a speech on the economic outlook at an Economic Seminar in Rochester, N.Y. And Business Manufacturing stats are coming at 10 a.m. ET.