It kind of makes sense if it is a smaller machine that uses thunderbolt for expansion. Thunderbolt has more than replaced the concept of internal cards. I used some of the worlds most highend HD video capture cards through thunderbolt...
Sorry, but Thunderbolt hasn't "more than replaced" internal PCIe cards.
In its present TB (v1) form, its bandwidth is roughly equivalent to a 4 lane PCIe.
The implications of this are that even the soon-to-come TBv2 will only double performance ... to an equivalent of an 8x PCIe, which means that to merely equal the 16 lane PCIe that's been in the Mac Pro since 2006, we need TBv3, which is the generation-after-next.
Thunderbolt is also capable of some serious raid storage which covers a lot of pros as well.
Yes, TB is flexible ... but it is still a bottleneck, and it is one where Video and Storage are now competing for the same lanes.
Since the 27" iMac has two thunderbolt ports I could see a new Mac Pro having four or more ports.
Good idea, but the engineering reality is that Intel CPUs have inherent limits on how many total PCIe lanes they can support, and for this conversation, TB is simplistically just a PCIe slot in a different plug format. As such, the notional idea of a bunch of TB plugs is CPU-limited.
A lot of pros use the 27" iMac now and are very happy with what they can all add to their system via thunderbolt...
And I used to be happy with 6TB hanging off of FW800 on my G5. Much nicer to only have one set of big fans running instead of a beehive of little ones.
So far I've learned:
1) Pros don't care about a Mac Pro being any thinner; the size of the computer doesn't matter at all
But somehow also
2) Pros can't deal with external optical drives, it's crucial that these drives are on one side of a piece of metal rather than the other
Yup. A big honking box reduces the noise of god-only-knows how many fans are running in all those externals, plus you're able to do away with an easy hour's worth of "re-setup" time any time that the desktop machine has to be moved. Take a look at the nightmare of some peoples' USB wire tangles (and multiple hubs) and now multiply.
How about a segmented computer with thunderbolt connectors between the computer components, allowing easy drop in upgrading of components without opening any boxes?
That is a good idea, but TB .. even TB2 or TB3 .. simply doesn't have enough bandwidth for it to be better than the current capability.
FWIW, my thoughts this week have been
maybe some of this interconnectivity could be done wirelessly ... 802.11ag? But even though this does represent a nice bump in bandwidth, (a) is it enough bandwidth?, and (b) how much additional lag time do the protocol layers add?
Why?
What possible reason would there be to remove an option for a optical drive bay on a PRO desktop machine?
Simply put ... more Streamlining of Manufacturing Lines.
FWIW, this streamlining is why I do see some potential for the "Modular Mac" concept, where the higher end power users buy multiple units to get made into a cluster ... from a manufacturing standpoint, Apple is able to punch out four identical units instead of having to design-manufacture-inventory a half dozen Mac Pro variants ... single/dual CPUs x Quad/Hex Cores x Slow/Fast GHz ... all in all, it looks like a really good idea, but the engineering to make that vision work is what is still a TBD.
Maybe Apple has successfully cracked these "hard nuts" engineering challenges, but there would have been Patents and the applications for these should have already been filed (and have come to light) if it is to be unveiled as a real product at WWDC 2013.
-hh