It's worth noting that we have still only seen a *tiny* slice of the world of 4E. We've seen predesigned characters—and while they play counter to our expectations for race/class combinations, they seem to tread the straight and narrow for class abilities, showing us all of the stuff we really expected to see.
When considering the canny fighter or rogue archetype, we really need to see more of the feats and powers available. In Bo9S, there was a large variety of "fighter" powers based on Int. I don't see why the same shouldn't be true here, and I can imagine the same being true for rogue powers.
That said, it's also possible that the "expertise"-style abilities will fall under a different stat entirely. Wisdom would be very appropriate for spotting when and how an opponent will attack and reacting quickly, for a "smart" defense. It could also be used to spot weaknesses in an enemy's defense for a "smart" offense. Likewise, Charisma is very appropriate for both creating openings and leading an opponent to attack where you are strong.
But really, the short form is: We have to wait and see. It's clear that the way powers use different abilities as the key attack ability across classes means there's tremendous potential for different ability score choices supporting different fighting/casting styles within the various core class/archetypes—but it's not yet clear whether or how this will be done.
