well, I haven't ran it, but if it falls in line with the rest of the savage raids that I've encountered, I think I can make some predictions

1) Party will be dead within moments of pulling. Massive damage AoEs, instant kill moves, mechanic combos, whatever puts us in the ground the fastest. Basically, a couple hundred hours of deaths while learning the fight like we're Bill Murry in Groundhog Day
2) If a single party member flubs a mechanic, or ANYONE dies, might as well wipe. Tank dead? Unable to execute tank swap mechanic, party died. Healer dies? Overwhelmed by raid-wide damage and everyone dead. DPS dead? Boss has 89 quintillion HP and will enrage in 8 seconds. Everyone dead.

Forgive me for my salt, but I'm starting to believe that SE is padding the Savage/Extreme raid tier so that it takes 3 months at least to bash through it all, and no one complains about content drought. I mean, there is difficulty, and I'm fine with it. I'd consider myself a challenge gamer, but my FC actually has people quitting the raid team for the sake of their mental health. So, when SE talks about clear rewards for Ultimate coil of Bahamut, I find that incredibly optimistic.