US stock index futures moved slightly higher on Tuesday, with the Dow Jones futures, S&P 500 futures and Nasdaq futures all showing modest gains in early trading. Federal Reserve Rate Outlook: Why Investors Are Watching CloselyThe Federal Reserve’s next moves remain a major focus for stock-market investors. Strait Of Hormuz Developments Impact Oil PricesDevelopments surrounding the Strait of Hormuz are another major factor for financial markets. Signs of potential progress toward reopening the Strait helped push oil prices lower after Brent crude had initially gained around 2%. Oil prices have recently remained closely linked to developments in the US-Iran conflict.