Ahrendts will receive shares spread over several different vesting periods between June 1, 2014 and June 14, 2018, assuming Ahrendts stays with the company. Were Apple's share price to rise, the RSUs could potentially be worth significantly more over that time.
A restricted stock unit is a standard form of stock compensation that reward employees for staying with the company. They are used as general compensation and for employee retention. Each RSU converts to one share of stock on its vesting date, typically set annually based on award date.
Because of Apple's upcoming 7:1 stock split, awarded RSUs will be multiplied by seven to maintain value. Apple does award dividends to employee holders of RSUs as if they were standard shares, so the more than 110,000 shares that Ahrendts holds will be worth nearly $1.5 million in yearly dividend payments.
Angela Ahrendts officially joined Apple earlier this month.