U.S. stock index futures edged lower in early premarket trade Friday, led by a steep drop in Intel shares following a disappointing outlook. Investors are also bracing for important U.S. economic data set to come out later this morning. At 5:57 a.m. ET, S&P 500 E-minis slipped 0.23%, Nasdaq 100 E-minis lost 0.35%, and Dow E-minis fell 0.24%. Intel plunged 13.6% in premarket action, while Intuitive Surgical gained 3.7% after surpassing quarterly estimates.