The FTX bullets feature Hornady’s Flex Tip Technology, which has two main advantages. First, it prevents the hollow point cavity from being clogged up with clothing or other obstructions. Second, it is designed to assist/start a reliable and consistent expansion even at lower velocities of short barreled rifles frequently used as home defense firearms. It also ensures instant expansion to prevent the overpenetration, which is also a very important feature for the home defense purpose.
As mentioned in the video, Hornady will initially offer .223 Remington Critical Defense ammunition with 55 and 73 grain FTX bullet options as well as a 155 grain .308 Winchester load. The nickel-plated cases are advertised to be better for visual reference when doing press checks in low light conditions. The Critical Defense Rifle ammunition also features additives in the powder to reduce the muzzle flash which is usually brighter in shorter barreled rifles.
I think the further expansion of this ammunition line will be the addition of 62 grain projectile for the .223 Remington and introduction of other calibers such as the .300 Blackout.
If this ammunition does work as advertised, which I think is possibly the case considering the reputation of Hornady, then this must be an ultimate home defense ammunition.