In this podcast, Prosser has no idea if it's going to be a redesign or only spec bump.
I've watched the show. He's deferring to Mark Gurman for the iMac specifics I think (something about identifying 'codenames' rather than specs). The most interesting bit about it was the news that it's been ready to go for an unspecified amount of time -
as per the CoinX leak in March this iMac.
These two bits of news suggest that Apple is waiting for some reason for the best time to drop the already finalised iMac; the Mini was refreshed over 6 weeks ago now with just a storage bump.
The mac line would make more sense with 3 notebooks and 3 desktops. If they sell more notebooks than desktop, why would they have a wider gamma in the opposite category? There is even still space for a Macboook ARM
On the Desktop side, it should be mini -> iMac -> Mac Pro.
I will be very likely wrong if the rumours of a new iMP are true.
If the sales split is 80/20 in favour of laptops, we can compare SKUs for MBA, MBP 13" 15w, MBP 13" 28w, MBP 16" against Mac mini, iMac 21.5", iMac 27", iMac Pro, and Mac Pro.
Clearly Apple probably sell fewer units of the desktops and if there's consolidation to be had the 27" range is a clear target but the Mac Pro and iMac Pro justify their existence by being halo products. Not something they seriously expect the average prosumer to be affording but they serve a different purpose.
I am a bit surprised we have not seen any leaks from the supply chain for a ~24" iMac case, especially if it has smaller bezels and/or a chin then the current 21.5" and 27".
Yes, I know Macs are not sexy and the last real "case leak" we had was back in 2016 when the MacBook Pro added the TouchBar. But I wonder if that is due to the follow-on models (even the 16" MBP) looking so much like the existing ones that nobody in the supply chain really made the connection that they were seeing something new - even the 2018 MacBook Air could have easily been confused by the supply chain as just a mild refresh of the 13" MBP w/o Touch Bar.
I admit no leaks likely means nothing about if it exists or what it looks like, but it does make me wonder that if there is a ~24" model, does it look exactly like the existing 21.5"/27", just in a different size?
It's easy to conceal a storage or ram bump inside existing 21.5" and 27" models and I think it's harder to leak Mac stuff as the potential loss would be greater - there's no case manufacturers out there paying a lot of money to get advance size specs for a 23" iMac so they can be quick to market.
And LG aren't going to leak the specs of an IPS panel they are going to hopefully sell to Apple - that's a recipe for disaster as Apple could bury it and take other business away to boot.
Even though I had speculated that Apple had to go to (thicker) 14" and 16" models to conceal the real reason for the upgrade - the magic keyboard - I was moderately surprised that nobody leaked the 16" prior to reveal. No surprises about lack of on stage presentations though - nobody needs to be confessing why the Mac had to go bigger and heavier rather than lighter and thinner.
If they release the 23" as an iMac Air they can give it a functionally new design, go SSD only, choose different CPUs (eg Comet Lake H, or Comet Lake S), lock in the RAM, whatever they like. They could even call it iMac Pro 23" and go with Xeon CPUs for all we know.
What I would say is that calling it a 23" iMac would mean they'd probably have to follow the design language of the iMac. And as per Jon Prosser's leak - he's not saying if it's a redesign or a storage bump.
If it's a redesign they'd have to do the entire range at the same time but at the moment only the 27" models are seeing stocks constrict at the moment.
There's probably another 6 weeks to go if Apple are waiting for stocks of the 21.5" to run down at the moment. I noticed that some third party retailers are running out of stocks to clear out too.