Tekrevue:

So, what does this mean? At best, it means only very modest improvements for some models, certainly less than most would expect from a system as old as the 2012 Mac mini. At worst, it means a dramatic decrease in performance, with some 2012 configurations absolutely destroying their 2014 counterparts in multi-core workflows.

The good, bad and downright ugly of the latest Mac mini. Not a machine I have a lot of faith in recommending.