U.S. stock futures were little changed on Tuesday night as traders looked ahead to the central bank's interest rate decision. S&P 500 futures were marginally higher, while Nasdaq 100 futures added 0.2%. Futures tied to the Dow Jones Industrial Average were up just 19 points. During the day's regular session, the Dow climbed to new intraday and closing highs, ultimately gaining 328.64 points, or 0.64%. The blue-chip index crossed over 52,000 for the first time during the trading session, but