For those interested in the nMP, especially the technical aspects, here are a couple of interesting articles…
The first by ArsTechnica…http://arstechnica.com/apple/2014/01/two-steps-forward-a-review-of-the-2013-mac-pro/
And to fill in some additional info an older article by AnandTech…http://www.anandtech.com/show/7603/mac-pro-review-late-2013
Especially interesting is the info that Anand provides in pages 6,7,8 about Apple's use of Xeon/Ivy Bridge vs Haswell, and how Apple has overcome limitations with Ivy Bridge. This answers some of the negatives put forward by the ArsTechnica article.
The articles may also provide the info for people trying to decide between keeping their old MP's, buying an iMac, or going for the gold. (Or perhaps that is giving up their gold or Bitcoins)
I think it also poses the question about waiting for the next version of MP; (total speculation here, June 2015) that we may see major changes in architecture like using the enterprise version of Haswell Xeons (due this year), dual ssds on the PCIe bus, better implementation of USB3(3.1).
Having been an early adopter for MP1.1, rMBP and even the old G5 tower, second and third iterations often bring best hardware. Of course, your work may dictate when to adopt, but souping up an older MP or even an iMac may be a viable alternative, at least for awhile.
Hope this helps, Greg