9x39 Wolf may be coming

According to firearmsnews the 9x39 round may be coming sooner than later to the US.  What does this mea and why is this something you should know about?  It essentially kills .300blk in terms of subsonic application.  It was originally designed as a special round for RU Spetnaz, and will likely see wide acceptance here for it's obvious hunting application.  For the rest of us, the 9x39 Wolf round will work well for barrier penetration and terminal ballistics.

Image from firearmsnews, 9x39 on the right.