No doubt the first thing that came to your mind when you read the title was "They were always useless..."
Well that's not entirely true, you see. Up until the update, they actually did function as meat shields that heralds of Tzeentch on Disks could take with them across the board, being much more inexpensive per wound than Flamers, the only other Jump Infantry in the codex.
And now the flamers were given 2 wounds, lowering their points per wound to lower than that of Chaos Furies.
This means that the Chaos Daemons update indirectly nerfed the most underpowered unit in the codex, and one of the most useless units in the game.
Not that that's a bad thing, it makes extra use of models that were already useful without forcing you to buy metal minis for one mediocre combat tactic. Still, just something I noticed