Awaiting the 'here's why"...
I think there are some nice aspects of the new Mac Pro, but the article never really answered the, "here's why" claim. It basically said how Apple has done cool things in the past (I agree), often pushing the envelope to the complaint of some of the user community (I agree), and then several pages of specs and machine details. So, why does that make it compelling or 'wow'?
OK, I want one, but I'm not the target market. The target market seems to have concerns about expandability, especially upgrading the GPUs. That's a pretty big thing for most 'pro' users. It seems more like this would be a great machine for the prosumer... but will they spend that much money?
Yes, it's a nice case design. That's about the only place I see innovation. The specs are OK. They do a few things maybe not yet common amongst generic PCs, but not uncommon in workstations or built-up performance oriented systems. A friend who built a Hackintosh a couple years back believes his machine will outperform the new Mac Pro (yes, something he built a couple years ago!).
It's fast... compared to the previous Mac Pros, but not necessarily that fast in comparison to current pro systems. It's on-par with some of them. The biggest thing is probably the quiet and lower power usage. But, these are just modern trends with the CPUs used and the case design. I'd love that, but I'd guess most 'pros' need other aspects more.
Ultimately, I think this design is a bit too far ahead of its time. Once Thunderbolt goes optical and we possibly acheive a true external bus (though internal bus won't sit still waiting either), this might work well. But currently, the only thing external is going to be storage and maybe some I/O devicese... and these will all add substantially to the cost (which is high, though not as crazy as many of the responses claim). It's certainly cool... I'm just not sure about Pro.