When you’re creating something this big and complex, writing your own engine makes debugging and new feature creation far easier. Also, our plan is to have ESO run on just about any PC or Mac – laptops included – that have been bought in the last five years.

I assume that's PR talk, because a five year old laptop should not be able to play a state of the art game. Well, unless it was a fantastic piece of hardware five years ago (top notch Alienware or similar).