The .AR223 reticle spoken of is a newer version of the common EOTech reticle A65. The normal version(A65) is a 1moa dot with a 65 moa circle, with hairs at 12 3 6 9 oclock positions. The newer one can be used to judge the climb/fall rate of the .223 caliber by using the lower dots at meter intervals. picture below.
Also the new Aimpoint style D1 recticle (1 Dot models), the XR308 & XR500 recticles are out as well for use with their specific calibers. All listed below
A65

AR223

D1

XR308

XR500