They are redesigning the exterior and all the components to mirror that of the current Mac Pro (but in a smaller and of course less speced package). It's pretty simple and I don't hear too many people saying guessing this. A delay this long usually means that they are redesigning something. Or else, they could have just easily updated the Mac Mini in 2013 with just increased specs and a new processor. But I don't think that's the reason for the 520+ day delay. They are changing the Mac Mini just like how they gave it an aluminum exterior back when it was updated from its plastic exterior when it first came out. All these theads about the Mac Mini being dead are complete eye rolls. People here just like to over-react.