I would assume there is an employee discount. It would only be for Apple products, not AT&T phone plans.
I've had two jobs, one Best Buy, where I couldn't get the discount until I worked there for a month. It's to curb people from getting a job, buying something, and quitting immediately.
I would bet Apple is the same way and I wouldn't expect too much of a discount. I work for an authorized reseller and discounts aren't much.