When do Mages learn Arcane Wrath?

Rank 1 at level 25, with later ranks at 36, 48, 60. Visit a class trainer in any capital.

Did Arcane Wrath change from Classic?

Arcane Wrath is new in WoW Forever and had no Classic 1.12 equivalent for Mages.

Rank	Level	Cost / range / cast	Effect	Classic 1.12
Rank 1	25	140 Mana · 30 yd range · 3.5 sec cast · 6 sec cooldown	Launches a projectile of pure Arcane energy at the enemy target, causing 122 to 146 Arcane damage. This spell gains additional Spell Damage equal to 5% of your maximum Mana. Coefficient 100% of spell power (direct)	new
Rank 2	36	220 Mana · 30 yd range · 3.5 sec cast · 6 sec cooldown	Launches a projectile of pure Arcane energy at the enemy target, causing 193 to 231 Arcane damage. This spell gains additional Spell Damage equal to 5% of your maximum Mana. Coefficient 100% of spell power (direct)	new
Rank 3	48	305 Mana · 30 yd range · 3.5 sec cast · 6 sec cooldown	Launches a projectile of pure Arcane energy at the enemy target, causing 296 to 356 Arcane damage. This spell gains additional Spell Damage equal to 5% of your maximum Mana. Coefficient 100% of spell power (direct)	new
Rank 4	60	395 Mana · 30 yd range · 3.5 sec cast · 6 sec cooldown	Launches a projectile of pure Arcane energy at the enemy target, causing 406 to 496 Arcane damage. This spell gains additional Spell Damage equal to 5% of your maximum Mana. Coefficient 100% of spell power (direct)	new

Improved Channeling (Arcane row 1): Gives your Arcane Missiles spell a 100% chance and your Arcane Blast and Arcane Wrath spells a 70% chance to not lose casting time when you take damage.
Missile Barrage (Arcane row 2): Gives your Arcane Blast spell a 40% chance, and your Arcane Wrath, Fireball, Frostbolt, and Frostfire Bolt spells a 20% chance to reduce the channeled duration of your next Arcane Missiles spell by 50%, reduce the Mana cost by 100%, and missiles fire every 0.5 sec.
Arcane Wrath (Arcane row 4): Launches a projectile of pure Arcane energy at the enemy target, causing 122 to 146 Arcane damage. This spell gains additional Spell Damage equal to 5% of your maximum Mana.
Accelerant (Fire row 1): Reduces the casting time of your Fireball, Frostfire Bolt, and Arcane Wrath spells by 0.5 sec.

Source: beta client 1.60.1.70753. Spell ID 1326082.