Where were you during all the rumors? I think we were warning everyone for the past 2-3 months not to buy MBP's. I think you're out of luck though. You can try, but try. Pack your MBP up in the box, put everything back in it as if you were expecting for them to take it back. Go to the store and explain your situation and ask nicely if you could possibly speak to the store manager.
I did the same exact thing, got a 2008 late macbook and 30 days later the 2009 macs came out. They upped the specs, lowered the price, and changed the name. I was sick to my stomach. I eventually sold it a year later and redeemed myself by buying a 2010 15 inch MBP right when they were launched.
edit: I just read your latest post, congrats!
Also, 2012 MBP's will most likely be getting redesigns. You should be happy Apple really didn't change the physical design of the MBP, or else you'd really feel