This one looks interesting: http://www.thefirearmblog.com/blog/2...-5-45mm-rifle/
Note this bit:
The AK-12 will be made available chambered in 5.45mm, 5.56mm NATO, 7.62x39mm and a new not yet named caliber. It is possible that this new caliber is the 6.5mm Grendel. Wolf Ammunition recently said they were in talks with Izhmash to produce Saiga rifles chambered in 6.5mm.