U.S. stock index futures rose on Tuesday as investors awaited December's inflation numbers and upcoming corporate earnings. The Producer Price Index data, due later today, will offer clues on the state of inflation in the United States. Quarterly reports from big banks are also highly anticipated this week. Wall Street's main indexes have been on a downward trajectory since early December. Yields on longer-dated Treasury bonds dipped on Tuesday, but are near their highest levels since late 2023.