Bexar: according to 'Cartridges of the World', the Chinese developed a new cartridge in the 1990's, the 5.8x42. They also created a series of conventional and bullpup configured rifles for it, which were first issued to elite units. So, depending on how fast they are re-equipping their huge army, the 7.62x39 may be obsolete in their service, though I'm sure they will keep a few million around just in case.
The projectile is semi-AP, like the SS109, and has a 62gr weight at about 3050fps.