Hullbreak might be phased out in favour of this new "pressure" mechanic, as some of the hullbreak vehicles no longer hullbreak, but have a pressure damage condition in its stead. Previously, your CE shell had to have x amount of force to trigger the hullbreak, this new system only checks if the shell has pressure damage effect, or not, but at the same time, having it doesn't mean an auto-kill, like with hullbreak. That's as much as I could scrape together by what I saw.
Previously only the 122 mm shells had pressure damage, now it was added to all HE, HESH, HEAT shells and ATGMs.