According to SoldierSystems.net, FN America has shown a .260 Remington conversion unit for FN SCAR Mk 20. What makes this news even more interesting is that it happened shortly after the US Special Operations Command (SOCOM) announced that they are exploring a possibility for a .264 caliber cartridge (6.5mm Creedmoor or .260 Remington) for the semi-auto sniper rifles.
Although there is no official information released by FN yet, I think they are most likely developing it in response to the US SOCOM interest in this caliber. The mentioned .264 caliber cartridges both will give more flexibility to the special operations snipers. To me, a DMR in this caliber is an improvement over a 7.62x51mm NATO one. The 6.5mm CM or .260 Rem both are adequately capable within DMR ranges and beyond with more moderate recoil (good to make a quick follow-up shot) and flatter trajectories of high BC, high MV projectiles. Also, they have sufficient terminal performance for the military use.
Of course, it is less likely to see in near future the adoption of these calibers in any larger scale than special operations use. Nevertheless, should SOCOM adopt any of the calibers, it will at least generate some legit data concerning the combat performance of the mentioned calibers, which will be extremely useful for the development of .264 caliber cartridges for military use.
Interesting note: a company called Handl Defense makes both 6.5mm Creedmoor and .260 Remington conversion barrel assemblies for the SCAR platform. So if you have a 7.62 cal SCAR, you can get one of these conversion units and conduct your own tests!