In a sign of just how much change is taking place at the burger giant, the company this week announced the departures of three key executives: Deborah Wahl, chief marketing officer; Lance Richards, vice president of menu strategy; and Julia Vander Ploeg, vice president of digital. The three are the first division leaders to depart since the hiring of a new U.S. president at the beginning of the year, former Kraft executive Chris Kempczinski. Their replacements — veterans of PepsiCo, Starbucks and Bank of America — start this month.