If I understand the idea correctly, you'd be swapping out your (depleted from a road trip) battery for someone else's (or Tesla's, if they shifted to a model where they provide some of the batteries at the swap-out stations), and then next time you wanted to swap again, you'd get another one. Doesn't seem to me to be a factor for resale. Seems like they're pitching it instead as a way to increase the range of a car while on the road, though I'm willing to say I've misunderstood based on my (twice) read of the article.

If they are planning to release further detail Thursday, though, that'll presumably clarify.