^My reaction to finding out about the Summoner changes. Gushing time!
Summon Egi: 3 sec cast time and less MP usage so recovery on death isn't as bad.
Dreadwrym Trance: Tri-Bind's potency is increased by 100, Bind effect is gone, is AOE! Ruin III is now oGCD.
Ruin III replaces Ruin I. Ruin IV replaces Ruin II, Ruin IV is an oGCD (presumably has no proc?)
Aetherpact/Devotion: buffs everyone around the pet!
Demi-Bahamut: size can be adjusted client-side. So Demi-Bahamut blocking is now on you and not the Summoner.
Sustain is back!
Welp! Summoner has pretty much embraced being the mobile mage that uses lasers/DOTs/pets. No mention on if Demi-Bahamut's AI has been fixed, but even if it hasn't, it's pretty much the only part of the entire rotation SMN needs to stay still for now. 20 sec out of a 120 sec rotation isn't bad. And Summoner AOE is back! No more boring dungeon runs after you've used all your Aetherflow stacks up on Painflare. Figuring out the openers for this is going to be fun...
Other Job Changes
Warrior
Shack It Off: Party-wide barrier based on the WAR's current HP. Can consume buffs like Thrill of War, Inner Release, etc. to increase the effect.
Steel Cyclone: HP regen increase
Dragoon
Heavy Thrust: potency decrease so it's not as bad if it's missed. Other skill potencies will be buffed to compensate
Eye of the Dragon: now has max 3 stacks!
Ninja
Doton: fixed a bunch of bugs/problems
Shukuchi: animation shortened to something around Tackle's length
SCH
Adloquium: MP cost reduced
Succor: barrier effect is now 150% of amount healed (same as Nocturnal Sect Aspected Helios)
Sustain is back for them as well.
MCH
Hypercharge: potency buff
Caster Cross-Role Skills
Addle, Manashift, Apocatastasis: shorter CDs
Surecast: effect does not drop for 5 sec regardless of what you do
More job changes coming in patch besides these
And Simplified Job Gauges are here!