I guess no new Mac Pro this year? No way I see them announcing their newest highest end system in a press release.
If it is not for sale for 6 (or more) months then it makes a real material difference how? If can't even pre-order for 5 months what exactly are you going to do with a dog-and-pony show vs versus looking at pictures on a press release?
The last two Mac Pros have been "look don't touch" first for six, or so, months and relatively limited information ( not all the spec and certainly not all the prices ). Then after a substantial period of time get to a more material release where at least have most of the specs. And then prices on pre-order.
Back in April 2017 Apple rounded up a handful of reporters and did a "round table discussion" on future Mac Pro direction. No big show and snazzy video. April 2018 was even more limited 'leaking of info" ( mainly about how not coming this year). If Apple isn't going to ship within 6 month of October and the other press releases there isn't going to be much to say.
However, if this is going to be another major chassis change ( e.g., Apple GPUs only going forward and cutting the slot provisioning in 1/2 or more. ) then a press release would be just as informational for Mac Pro users to do future planning as a dog and pony show. [ Like the Xserve going away telling folks who want the current version 9 months ahead of time is enough to put the purchase orders process into motion so can make arrangements to get some of the last batches. ]
When Apple effectively said " Mac Pro later" they painted themselves into a corner in terms of 2022 pragmatically making some announcement later in the year. Even if that follow up announcement is "shipping in 2023 " . And going to have to control the 'spin' here also as they won't be completely the transition in "about 2 years". So invite a small crew of journalists they feel will craft it is as a "good news story". ( say something nice about us or you don't get the highly limited edition press pass and you'll get high clicks and ad views. ) .
Mac Pro doesn't merit a dog and pony show all by itself. It isn't that critical of a part of the Mac line up. ( e.g., how there is a broken analog clock prediction every Spring that a new Mac Pro announcement is coming at WWDC that Summer only drives home the point that the Mac Pro can't do it on its own merits. ) . If the other Mac stuff is SoC replacements in the same chassis boring. No reason to do a multimillion dollar production for a Mac Pro product that isn't even going to ship this year. If the other stuff was deserving then the Mac Pro could piggyback on that 'show', but there isn't much 'sizzle' here in the rest of line up changes either apparently.