It might be that this is Chronomancers new skill instead of Haste and Quicken, putting both skills together into one, and adding Time Forward so the number of skills stays the same.
In general I’d like to point out that there is a possibility that every Class that does only have a single C3 skill up until now will receive another one (like Thaumaturge, Swell Hands would fit perfectly to the absence of another C3 skill besides Swell Brain).
If we bring up a list of Classes without 2+ C3 skills, we get:
Cleric, Krivis, Dievdirbys, Sadhu, Pardoner, Plague Doctor [Zealot,Taoist,Exorcist]
Swordsman, Hoplite, Cataphract, (Dragoon), Templar [Murmillio, Retiarius, Lancer]
Archer, Quarrelshooter, Hunter, Sapper, Wugushi, Rogue, Fletcher, Cannoneer [Mergen, Hackapella]
Wizard, Pyromancer, Cryomancer, Linker, Thaumaturge, Elementalist,Alchemist, Warlock, Featherfoot [Enchanter, Sage, Onmyouji]
I doubt that Rank 8 Classes will be included in the list, so this is what is probably the pool of Classes the new skills can be attributed to.
Judging by the theme, it’s likely that every hidden Class receives a new skill:
Miko: Omikuji
Shinobi: Raiton no Jutsu
Chaplain: Paraclitus
Appraiser: Insurance
Nak Muay: Break Brick
Rune Caster: Free Step?
Advanced Orders: probably Hunter, it’s the only Class that orders something/someone around
Binatio: probably Pardoner, using money to double buff effect/-duration wouldn’t surprise me since the Class can already double debuff durations
Block and Shoot: Quarrelshooter
Concentration&Sharp Spear: Cataphract & Hoplite; Concentration was a Spear-bound Lord Knight skill in RO, so I guess it’s coming for our spear users, Sharp Spear is clear
Hallucination Smoke: probably Wugushi
Hasheeeesh: probably Dope Master… errr, I mean Plague Doctor
Mangle: probably some Wizard skill, as “Wringer” is used for some stage magic trick
Piercing Heart: probably Rogue (I guess another skill will be replaced with Knife Throwing) or maybe Cataphract/Hoplite?
Fire Claw: Pyromancer
Aggress: probably base Swordsman
Fire Blindly: base Archer? or Fletcher?
Visible Talent: I guess Dievdirbys (it requires the most talent of the Cleric Classes and probably all jobs)
Swell Hands: Thaumaturge
Hard Shield: Templar (since it’s mainly a defensive Class) or Mangle (Mangle could also be the antique Manganum, a siege weapon)
Enchant Glove: maybe Alchemist?
Elemental Essence: Probably Elementalist ( I guess they’re copying the elemental spirit system from RO’s Warlock where there are those balls flying around you)
Rampage: Cannoneer?
Warlock: Summon Skull Wizard