You can learn more about this by following the link, but here's why I am interested in this cartridge. I'm looking for a legitimate cross over between a plinker and smallbore centerfire because once upon a time, you could get reasonable priced .22-250 or .223 rounds for plinking. Now those rounds have gotten really spendy, so a .17 caliber rimfire that reaches out a little farther than a 17HMR could fit the bill. It remains to be seen, but it's cool to see people working on it. Check out information about the new Winchester round
No words on what guns will be built for it, but I know I would like a reasonably priced semi-auto, or bolt action that weighs similar to a hunting rifle. I know, that's a lot to ask, but hey, a guy can dream.