We confirmed back on 2/25 with the original base wheels. On Friday, when we saw the update, we contacted our DS about our options for possibly swapping to the new wheels (even if it required a change order), and as others have said, today he called and told us our S was already in production and it would have the legacy base wheels. I asked again about the possibility of a change order (the new wheels are worth $500 to us, at least), but he wasn't sure.
We're not too bent out of shape over this, since we didn't buy the car for the wheels, but I can echo the feelings of others that it'd be nice if there was better communication in situations like this. Tesla updates their cars all the time, which is great, but there probably should be a more formal guideline regarding "here's what happens if something changes mid-production."
Over the years I've seen folks get an upgrade for free, have the option of paying $500 for a change order, or have no choice other than outright cancellation. I don't blame the DS - I know they're less in the loop than we are sometimes. I mean, I assume they're not going to the car configurator every day to see if something changes like some of us. I just wish they had an answer that could be easily given driven by stable corporate messaging down to the centers.
Still, if this is the worst change we miss out on based on the timing of our order, then I'll consider myself lucky.