Following the announcement of Tim Cook's impending departure as Apple CEO, John Ternus, will likely lead to a succession of changes at the top of the company, including both promotions and departures. Senior staff member Mike Rockwell, who was reportedly considering leaving the company entirely or moving into an advisory role, may also be considering a larger role under the new CEO, Ternuss, under whom he will replace, is concerned about his ability to advance within the new structure of Apple. The announcement is expected to lead to significant changes in key roles at Apple this year.