Stock futures pointed firmly higher, with Nasdaq futures climbing and Dow futures paring early gains ahead of Tuesday's open. Dow futures halved their early advance to a 25-point gain. Nasdaq 100 futures pressed ahead 15 points and were rising. S&P 500 futures were up 3.75 points. Apple (AAPL) climbed nearly 2%, giving Nasdaq 100 futures a lift in preopen action. Bank of America (BAC) bolted more than 2% on an upgrade from analyst Meredith