The marked red aoe of death zones on the floor during boss fights and other hard encounters have long plagued Endgame content forcing people to get out of the "red sh*t" at least 2 seconds early or they die.

Has SE released anything giving concrete information on a fix or some guesstimate ETA?

So far all I know is that they have acknowledged the problem, seeing as how this is arguably the biggest flaw the game has right now I'd hope their would be more than just that.