I'm just referring to launch day... Not literally "miss" out on the Pro. Of course, customers will be able to get it on the second run. But I do believe the first couple of months won't see a huge stock of these.
I actually don't think they'll sell out in most stores or for on-line ordering. And if they do, I think there'll be more stock within a week of people being turned away. Again, this is not a really hot item like a major iPhone upgrade. It's a small market for an upscale buyer and will be a small minority of the tablet market. But Apple put a lot of hype into the announcement, and I don't think they want to run out right away. In fact, I think the rumored delay is to make sure they do have enough stock on hand for the release.