Trading in the U.S. index futures suggests that Wall Street stocks may open Tuesday’s session notably higher. The commodity sell-off is proving to be prolonging, with oil moving menacingly towards the psychological barrier of $30-a-barrel, and the rest of the commodities are weaker. The dollar is mixed. Notwithstanding reports of intervention to stabilize the yuan, Asian stocks ended mostly lower. The European markets, however, rallied sharply, led by retailers amid some positive domestic corporate news. Traders in the domestic markets could also focus on the Fed speeches scheduled for the day.