Read just a little about this on another forum; 224 Valkyrie. Very similar to 224AR http://www.6mmar.com/224_AR.html
except that it's based upon the 6.8 SPC instead of the 6.5 PPC and is intended for use in AR's.
Possible that Remington is coming out with it at shot show 2018??

Anyone have some information on the development and purpose? Is it just another new ammo for AR15 or does it serve some specific purpose such as long range sniping in a lighter platform?

Apparently go gages are already available.

What with the many dozens of hot little variants of the 224 that have existed for decades, what's special about this that will make it commercially viable?

inquiring minds will want to know....