Summary: Here's everything you need to know before Thursday's opening bell: Roku shares plunged 17% in pre-market trading on tepid first quarter guidance. Ford North America President Raj Nair left following misconduct allegations. A former Google software developer is reportedly suing the company, saying he was fired for his pro-diversity stance. St. Louis Fed President James Bullard said investors may be "getting ahead of themselves" in expecting four rate hikes this year. U.S. stock futures pointed toward a positive open. Watch TheStreet's investing interviews on Youtube
