Documentary was somewhat meh... No actual info, but more PR than one prefers but at least it has some gratuitous juicy shots of interior and firing. It's closer to tank porn than documentary
Improvements, chassis logistics:
1. Complete modular design across Armata/Kurganets chassis with shared parts. In itself this a sub category leading to much more cost efficient
manifacturing and
maintenance. Mind you, it does not mean that initial production will be cheaper, however given enough time it will have significant financial impact given enough time.
2. Modular armor design to be replaced not as a whole but in sections. For example, damaged section can be replaced with more simplicity since most of the vehicle has modular reactive armor. Reactive armor is now integral part of vehicle.
3. While here there is a saying for Russian made stuff is robust, it is another matter when it comes to maintaining powerplant on soviet tank. t-72/90 and t-80 have a nasty reputation when it comes to engine swap and repairs, robust as they are. Armata very much addressed this, it has been noted that engine aside from power limiters (engine regimes on 1200hp for regular driving, 1500hp in regular and 2000hp as maximum power output).
4. Platform is built to accept current generations hardware improvements including ones learned from "object 195", metallurgy advancements, fire control/observation system, suspension and so on.
5. integrated active protection system. Not like it
can be added on on but rather entire vehicle is built around it. Inherited advantages of such approach is quite obvious. Experience has shown that such systems are crucial part of vehicle protection.
Improvements, Gun and unmanned turret.
1. Autoloader redesign, improved fire rate, much longer APFSDS (Vacuum-1), more powerful/larger propellant. Gun itself is new 2A82.
2. Unmanned turret is next step in evolution of Soviet tanks (Russian rather). In itself it is a grand undertake.
3. Future improvements. It has been noted that there is a bigger gun already developed. 2a83 is next in line and T-14 can pretty much be swapped without too much complications. Allegedly.
So to conclude, it would be much more expensive to upgrade entire fleet of previous generation to modern standards, none of which will be as effective as t-14. Effective, Armata chassis represents modern Russian approach to military doctrine. Efficiency in cost and maintenance, quality over quantity.
Now after all that I myself am somewhat skeptical, in reality Armata has still way to go before it achieves what it claims it can. It is not shown but every vehicle
HAS to get over child sickness before it matures. Such is the rule of life.