What should I do if I bought prime rib roast too early?
Typical refrigerator temperature is a bit too cold for true dry aging. I don't think you will perceive much of a difference, even under ideal conditions, in only two weeks.  So, for me, the decision is based on whether or not I want a prime rib taking up prime real estate in my refrigerator.  I would freeze until a couple of days before your meal.