I agree with Bob S. It wasn't clear to me whether you've taken the car home yet or if the deal is still in progress, but if you haven't signed on the dotted line just yet, ask the dealer to include an alignment check (specifically, a camber check) as a condition of sale. If you already own the car, see how open the dealer is to checking the alignment for free anyway. Strut rub is a well-documented issue. Still, most dealers won't fix things that aren't demonstrably wrong--in other words, they likely won't adjust your camber "just in case."
With my '05, strut rub was an intermittent thing. The strut tower on the passenger side was rubbed free of paint in one spot, but the dealer tells me it appeared that the tire and strut only came in contact when the suspension was compressed, not when I was just driving straight down the road.
As for "tell-tale signs," I'm afraid I can't offer much. What caused me to report the problem was the disproportionate wear I noticed on the inner tread rib (not the sidewall, as some have experienced--just the actual surface of the inner rib, with more wear evident toward the edge). I had felt or heard absolutely nothing.
The good news for you is that not everyone with 17-inch rims experiences strut rub, so you're not automatically doomed. Just keep an eye on your tire wear. Every time you wash the car, for instance, just get down on all fours and take a peek.