I'm a former Apple employee with several coworkers who still work at the company. All of them who ordered all have June delivery estimates as well. Speaking as a former Apple employee, the way it works for popular launches/product releases, is that we would have to wait for several weeks to several months after the product launched before it was even available to order on the internal employee online Apple Store (such as the iPad Air and the iPhone 6/6+), to allow regular customers to get their products first. In this case, they uniquely allowed employees to get 50% off and order the same time as regular customers.