I just called the 5th Ave store in New York and they had no idea when the new MBPs would be in store. She said that when the in store pickup option is available in the online store they'll be available in store.
She seemed to think that things could change at any moment and was waiting to hear something soon.
Update:
The online store now has the in store pick option available but none of the new models come up as actually available to pick up at that store when you select it. And ... ack! The previous 5-7 day shipping time has gone up to 7-10!. How will I wait that long?