Stock Market Today: Futures suggest S&P 500, Nasdaq may rise at the opening bell, building on record highs; Dow also set to increase at the open as oil prices pull back on hopes of end to Iran war; earnings optimism buoys sentiment. MarketWatchS&P hits fresh record as oil continues pullback on hope U.S.-Iran deal is close: Live updates CNBCWall Street looks for direction as investors tune in for potential US.-Iran peace deal updates MSN