100% with you regarding Apple and "Pro" customers - Apple is not overactive.iMac Pro is poor value now if it going to be updated within 6 month to better screen and, GPU. I think iMac Pro require components not released yet such as the rumoured miniLED which is delayed. Is long as the motherboard can take a new xeon, they should just drop it in. If a new motherboards is needed like the Comet lake CPU, it is a bigger operation.
A spec bump within the same case sounds unlikely if the entire case needs a redesign to handle a miniLED display next year. If miniLED is delayed until 1H 2021 then Apple could eat the delay and leave the iMac Pro for up to another year. By that time RDNA2 GPUs would be readily available to drive a miniLED panel in a full redesigned product.
For the 27" iMac, if Apple are not just doing a storage/RAM bump as per the March 'ready to drop' leak then a logical step up sees Apple tackle the Comet Lake S heat issue with the iMac Pro case and cooling system - bye bye upgradable RAM.
If Apple are doing a storage bump - and I would include upgrading to all Coffee Lake Refresh CPUs in that category - then I could see Apple skipping Comet Lake S in favour of Rocket Lake S.
Rocket Lake S next year sounds more like the system that Apple are waiting for - with Thunderbolt 4, twice as fast SSD, and extra PCIe lanes available to truly push 4 Thunderbolt ports out in the hand-me-down iMac Pro case.
I do not agree when people compare prices for iMac and iMacPro, trying to figure out which is better and appealing to the processor and GPU power only. Server hardware speaks for itself, it becomes outdated much more slowly as well as any equipment from a professional segment. Such a technique is a priori designed for a long load, in which the consumer iMac will either skid or fail more quickly. This means that iMacPro even from 2017 will remain a workable (and valuable when selling) machine for a long time, a very long time. Longer than the 2019th iMac and possibly even the 2020th in its future.
In addition, many people even forget about the iMacPro sound system, an analogue of which, according to some estimates, costs $ 800-900 separately. And so many little things can be found that if you combine everything at once, it turns the iMacPro into a better offer of price/quality. Unless, of course, you are ready to spend money on it.
I can't comment on the efficacy of the iMac Pro sound system but this seems like a good point to discuss equipment choice in the iMac range.
Apple's eccentric choice of equipment doesn't really translate well to choices made by gamers - hence the myriad of complaints from PC builders who min-max in completely different directions.
Any speculation over a 'gaming Mac' should be put to bed immediately by the fact that Apple's software support is nowhere near good enough.
Hand $5k to an experienced PC builder to make a gaming PC system and you'll find an overclocked CPU with Nvidia RTX GPU and a separate monitor panel that won't be 'retina' but will be up to 240Hz with GSync. Immediately you're on the back foot because Apple don't do any of those - throw in DirectX 12 over Metal and Apple gaming is a total non starter.
Gamers aren't interested in Xeon, ECC, 60Hz monitors (no matter how nice), 4k monitors (unless the PC is extremely expensive), or an AIO setup (for cooling purposes).
More likely in my opinion is people looking in astonishment at the potential of RDNA2 GPUs being used in future along with variable refresh panels and translating that into 'gaming' whereas Apple are probably looking at power savings and video editing use.
Let's be clear here, though, Apple are probably looking at how much performance they can get per watt out of RDNA2 rather than how much outright horsepower they can get out of it. I wonder if they are looking at RDNA2 graphics driving a 4k 120Hz panel with mini LED backlight for example?