The Wizard has the exact some wording on Weapon Specialization largely because it is the same wording everyone gets. Same for all the martial classes that get Greater Weapon Specialization.
I'm fairly certain they have no plans to give Wizards Legendary proficiency in Weapons.
They don't need it, weapons are not the Wizard's area of expertise. Unarmed combat is the focus of Monks. Since they don't get and don't need a bunch of weapon and armor training, I think I'll let them get Legendary in both the armor and attacks they can use. Though I could say that the Graceful Legend ability at 17th allows you a choice: You either get Legendary in Unarmored Defense or Unarmed attacks. Whichever you choose, the rest of the ability stays the same. That way no class would get both Legendary attacks and defense. Would that be better?
Edit: I went ahead and changed it. Now Graceful Legend gives you a choice of either Unarmored Defense or Unarmed Attacks to boost to Legendary. The rest of the ability is unchanged.