Will KMS change the magic formula?

Pretty much this, any changes reguarding INT could make Magical classes more screwed over then before, or Overpowered.

If the current Int/Magic formula is changed, it could also cause chaos with the Magician/Evan community across MS, and that is never a good thing, really Nexon is better off giving LUK an Magic attack boost as Takebacker mentioned, so there is an actual point in raising Luck above 4, or just boosting the base power/speed of spells again.

Pretty much this. If they just changed the magic attack formula to be stronger, let's say twice of what it is now, mages would be overpowered and broken. They would need to put a cooldown on ultimates as Evan has it, because nerfing it's attack wouldn't be enough.

I personally think the magic formula shouldn't be changed. Mages are fast trainers, not bossers. You should keep / have kept that in mind when you decide to create a Magician. Giving them the ability to boss while still keeping they training speed would be unfair with any other job. So if If they do change it, I hope it is something regarding making Luk more usefull or making magic attack more Stable as fiel says, or better both.