Just went and picked mine up. I originally went on Tuesday and got the "shipment got delayed" story, but was up there again today and figured why not check. The CSR went to the warehouse and came back with it so the girlfriend was pretty excited to add that to the collection finally!
Our main concern wasn't that they would sell it, we were more concerned that best buy's site would automatically cancel our order next week since it's been stuck on "Ready to pickup" since Tuesday.
It's also worth noting that our Pit technically wasn't ready for pick up even when we picked him up today. The lady who does in store pick up went to check on it and the warehouse had them locked away and said they weren't ready yet. She pretty much made them give it to us since we had been waiting for it and had been patient about it. There may be some other Best Buys that have them in but have yet to sort them out or whatever from the warehouse. If you haven't had the order canceled, it wouldn't hurt sort of checking in to see if there is any updates on it.
Like he said, our biggest worry wasn't getting it as our Best Buy has been great about putting preordered ones aside so far, I just didn't want the order to cancel on the off chance that they didn't come in soon enough. Luckily it worked out.