Well they’ve invited journalists to come to Apple to talk about it, as early as two calendar years before the thing actually ships, which is unprecedented for the modern Apple,
They actually did not talk about the next Mac Pro much, other than they intended that it would exist and that it would have a few general, wide-spectrum criteria. The vast majority of the discussion was about the old, existing product did and didn't do well. They also talked about existing products and trends of customers buying those. About Apple's approach and general dedication to the Mac.
Lots of folks took the discussions of what the current Mac Pro didn't do well at and presumed that Apple was going to do a complete 180 turn. There are no Apple comments to directly support that. Similarly some folks have taken what Apple said that the current products did well ( and that they strongly hinted at ( in 2017) and delivered on (2018 ) an iMac Pro ) that Apple is going to task the next Mac Pro will all the same constraints as the iMac Pro except an attached display (since Apple said a display was generally coming). Again there are not Apple direct comments to support that either. They discussed no explicit, unique details of the Mac Pro physical capabilities at all. ( other Macs have a Thunderbolt socket to connect an external display to so not a huge leap that the next Mac Pro would have one. Although they didn't explicitly confirm that either. )
The most direct explicit pronouncements have been about which year the next Mac Pro will
not appear in. There is a huge gulf between that and low level details (or requirements ) about the system.
and if you take at face value the research they say they are doing into what it needs to be, well, that sounds pretty serious to me.
What research? The details that this years "workflow" discussion where not about the Mac Pro specifically. In fact, the Apple representative said that the "Pro workflow" team was about all Macs ( perhaps a focus on those in the Pro space which Apple has explicitly outlined is represented by the MBP , iMac (and iMac Pro) , and lastly by the Mac Pro).
The Final Cut optimization that the article discussed in detail was applicable to all Macs; not just the Mac Pro. eGPUs... could be used with all relatively recently updated Macs ( except the Macbook, which hasn't seen a enclosure update in years at this point; so still stuck with just plain USB-C. It has just been processor speed bump. ). The iPads as controllers? Again, not Mac model specific.
Apple's discussions about the 'Pro' space have never been solely (or even primarily ) wrapped around the Mac Pro in at least the last decade. The Mac Pro is a "nice to have" product for them. It is not the central strategic core of the Mac business. Folks can stand on their head and read that the Mac Pro is super strategic into their Pro discussions, but if objectively read what they are saying that isn't present.
IMHO, a sensible path for Apple to go forward on is to improve the stuff they felt worked OK and to find a better compromise on requirements/constraints for that stuff that didn't.