Looks like a pretty cool round. I wish they would have made the O.A.L. a little shorter, similar to the Creedmoor, so it will fit and feed in a SA Remington without the bullets being seated so and deep taking up powder space. I think Hornady should have standardized something like the GAP 4s or the Sheman Short, something that's been out there and is proven and fills the niche. The biggest thing I dislike is the case length, unless you are running a Wyatt's box, you are not going to feed these shells out of a Remington or 700 clone at the COAL that they list. I know it will feed if you seat them deeper, but are the SAAMI spec reamers going to have a long throat, making accuracy loads hard to find if you are limited to mag length? Definitely will be interesting to follow and see what more information turns up.
On a different note, I believe Hornady chose the RCM case because it is of their own creation and they use the same basic design, just longer, on their .375 Ruger. I for sure would be using my own design and not someone else's if I created something previously and was improving or building from it. Hornady put a lot of time and effort into creating the RCM cartridges and I don't think they will just throw that away. Dave Emory and all the guys working at Hornady are very smart and I really think they do their homework and come up with great ideas. For them, it makes sense, they created the basic case design the PRC is based on, so why change it in their lineup of cartridges?
I like to see new products and see companies trying to release cool stuff. Though I think it could be better, seeing the 6.5 PRC come out of SHOT Show is a lot more interesting to me than the bazillion "new" ARs or all the tacitcool furniture for them. One thing I am waiting for is Hornady to embrace the 7mm LRM designed by Gunwerks that utilizes the .375 Ruger case. There are plenty of cartridges out there today, but the beltless, standard length 7mm LRM or something similar to it would be awesome. They would offer a small advantage or equate their belted brothers such as the .264 Win Mag, 7mm Rem Mag, .300 Win Mag, etc. but do it in a smart and efficient case that all the current belted mags should have originally been designed as. I have no problems reloading for a belted case, but it truly is old technology that we need to leave in the 20th century and move on from. There are so many cartridges out today and we really don't need anymore, but a good lineup of magnum cartridges, similar to the Gunwerks LRM design, could be the next step forward and could have the potential to become the next generation of long action magnums if marketed right and actually chambered in a wide selection of factory guns.