CapnZapp
Legend
It is the power you use that determines which attribute you use.I haven't read the Feat yet, this question should be posed to the Rules Lawyers at WotC.
But as far as I can interpret from what was written here, what ever gave a Wizard (with the feat) the ability to use its Intelligence for a martial attack in the first place?
So it isn't that I'm arguing the Wizard gets to use Int with martial attack (weapon powers); I'm arguing the feat allows the wizard to use a sword as an implement - with his arcane attack (implement powers). And these use Int (or, at the very least, they don't use Str).
Getting to use a sword as an implement means getting to use it as the conduit for your arcane spells. Remember how you only get the sword's proficiency bonus when you use it as a weapon (with martial exploits).
Cheers!