Actual we do know the changes. They have been pretty clear that Crystal Tower will drop gear intended to allow you to progress through Coil.
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Except they aren't. Yoshida said he expected no more than 100 people to have beaten Coil by 2.1. The reason Crystal Tower wasn't implemented was because they were still balancing it around having 24 people. If Coil wasn't balanced around people with ilvl70 gear they would not have released it also. I personally have tanked on WAR in nothing but DL+Relic Weapon in Coil up to Turn 4. It's possible, you don't need a PLD it just makes the randomness of the fights slightly less random. I don't know why people keep bringing up PLD as if it makes Coil faceroll easy when it doesn't. Even if WAR was buffed to PLD levels of mitigation, you would still need everyone else including the WAR to perform their job at optimal levels in order to succeed.
We know the changes are that Crystal Tower gear will be below Mythology/Allagan gear so gear is not going to magically make WAR equal to PLD. We already have ilvl90 Weapons as well in Relic+1 and the damage increase does not allow WAR to self-heal enough to offset the damage difference PLD mitigates. Also any gear that gets added for WAR will be added for PLD as well since gear is Homogenized in this game into either Tank Gear (WAR/PLD) Healer Gear (WHM/SCH) Caster Gear (BLM/SMN) and then Ranged/Melee DD each have their own set for some stupid reason.
I haven't done coil yet, so I can only go off of what's in the videos. The first attempt at Cad, you hear them start to stress a bit at 4 stacks, and after the wipe you hear the WAR say outright he's surprised the healer kept him up as long as he did. Then you notice that after the first snake dies, the second one has 8 stacks, and the PLD pops Hallowed Ground. I'm fairly certain a WAR would die there.
The second video appears to be more about tank-swapping than anything (and interrupts, but that's as much a raid thing as anything). Seems like the only reason the PLD died was because a healer went down, and the PLD died during rez animation.
the first snake never died, it recombined with the other snake after the warrior died and either combined stacks or goes straight to 8 (I'm not sure which). My group does this fight the same exact way the only main difference is our group has a SCH instead of a second WHM. Personally I think they would of had it the first time if the healer on the WAR would of utilized Stoneskin.
They are not designed to tank the same kind of mobs as good. Good at different things which is good and how FF usually works.
I'm a long time FF player and you're flat out wrong xD. Ninja (wasn't designed to be a tank, but we made it one anyway :p) tanked just as well as pld they simply had different types of mitigations. (I preferred ninja tanks when they were good and well geared, because they rarely took dmg).
Think you're missunderstanding since you prove my point, didn't want to bring up Ninja job since not sure everyone is FFXI vet :-) Both PLD and NIN was used as tanks but not designed or rather used to tank the same mobs/events. Ninja on Odin? Nono. Ninja in Dynamis nono :) Etc.. Ninja on Ultima/Omega - Yes. Good at different things. Prob the same thing here in FFXIV with PLD and WAR, only out 1 month, give it 6-10 months and ppl will prob figure out events where WAR is better than PLD, who knows what crystal tower entails, hopefully a combination of WAR and PLD is optimal.