Well, the space gray is definitely a must for the finish, along with the accessories like mouse/keyboard.
I ultimately believe the form factor will be just like the G5 cheese grater, but a bit smaller and thinner, but not too small. Probably 2x bigger than a BTX form factor. It doesn't need to be extremely big and heavy like the old generation Mac Pro's since it will likely use the proprietary SSDs like those in the iMac Pro.
Doubtful it will be thinner due to card heights and fan diameter(s). Shorter (e.g., no 5.25" bays ) as the driver of "smaller" , yes.
The T-series based SSDs don't lend themselves to plural SSDs. T-series SSDs are only going to be one since they have other functions that shouldn't be duplicated in them also.
Apple could try to stuff the M.2 deviant socket (which pragmatically predates M.2 a bit) from the laptops and MP 2013 into the new Mac Pro as a secondary (and 3rd ?) SSD expansion path but that won't buy them much if they are winding down that old SSD controller (and highly customized 3rd party ones). It would make far more sense just to validate and buy some 3rd party SSDs for those BTO options; just like the RAM. Secondary ( and typically capacity expanding) SSDs aren't going to be particularly different from those attached via Thunderbolt in terms of driver and "trimforce" aspects. Apple shows all the signs of going into the default secure boot SSD business, not the general SSD business.
If the dogma is so strong that it can only be Apple labeled SSDs then probably just won't get extra, non-primary boot SSD expansion options. Wrapped in the dogma of if Apple doesn't make it themselves then it doesn't exist then the other storage slots would disappear. I don't think Apple is really going to drink the kool-aid that deeply for the next Mac Pro.
PCI-e based M.2 has gotten alot more mature at this point. So there isn't a good reason for Apple to ignore it. If there is any amount design priority placed on $/GB capacity then 2.5" SATA drive may make the cut also. ( apple is is on a "internal HDDs are over" train though. Disappeared from Mac Mini and entry costs just went up).
There wasn't nothing wrong with the cheese grater, the handles were nice for easily lifting and moving the unit. The objective is to make modular, so, video cards, memory will probably be your options to upgrade include the processor to some degree.
The handles are a bit rack hostile. If Apple is still manically focused on the Mac Pro being a literal desktop system then the handles aren't particularly literal desktop friendly either. Height + feet + upper handles was more so the combined issue.
The handles were also to be symmetric with keeping the system off of the floor also.
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It's a shame, because they could at least make their iOS gaming experience more enjoyable—the abandonment of Game Center is an example of where it's clear they didn't have anyone who really cared much about games at a high level.
Game Center is/was to a large extent a "social media" endeavor; not really a gaming thing. It ended up with the rest of Apple social media embeds that Apple has done .... not really used that much. It isn't that Apple abandoned it as much as most folks didn't pick it up. ( both sides. The devs would typically like to own that because it is a more data to mine (and perhaps make money on) and the users have other social media 'drug' fixes to drift off into. )