If you visit Apple’s 2013 Mac Pro page, you’ll see a sneak peek of the Mac Pro being released later this year.
One feature of the page are videos showing internal elements of the computer. In order to have a close look at how it’s put together, here are the videos as a single movie:
If you want to get the source video, visit its Vimeo page and click the Download button. This is is helpful if you’d like to step through the video frame by frame.
Room for improvement?
As regards how upgradeable the computer will be, it might be almost as easy as the old Mac Pro to modify. Apple have already stated that memory and flash storage will be user-configurable, however based on stepping through the Apple video, it seems as if the central chassis is put together with hex screws, and the three main boards are attached with a few screws:

The base board is then attached to the three card sockets:

Perhaps Apple will offer a configuration of the Mac Pro with only one GPU card, and publish the specs for third parties to supply CPUs.
Configuring Mac Pros with alternate GPU cards will have to be done by confident engineers, but probably won’t require a visit to an Apple Store.
According to a ‘friend of a friend’ report from the Worldwide Developer’s conference posted to the CGSociety forum:
|
OK – I have a friend the WWDC and he has asked a lot of questions to the right guy. The Graphics cards in this new macpro are swappable. But they are bespoke and a new form factor it seems. Ram / GPU and the Main drive is all updatable – it does seem that there is the possibility of installing 2 or more of these PCIe drives…
|
Future versions of the Mac Pro may have more space for GPU cards. With a slightly larger enclosure, there could be four instead of two:

Professionals welcome
With the announcement of this computer, there’s no doubt that Apple is still interested in professional markets. Despite the relatively limited opportunities for making billions in profits, they must see value in serving those who want the fastest personal computers in their offices.
The most distinctive feature of the sneak peek is the fact that Apple felt under enough pressure to pre-annouce the computer at all. The Apple of 10 years would have created an Autumn 2013 event in Los Angeles featuring professionals from the film, TV and music industries extolling the virtues of Apple’s professional hardware and software solutions.
What else can we get them to do?