The only different things I noticed:
A larger, easier-to-read font for the department names on the boxes.
For the bonus round, the 1:30 clock is now sponsored ("Let's put 90 seconds on the Ragu clock").
Sometimes, as they go to commercial, the camera pulls back to reveal a display of some product that paid for the brief visual promotion, sitting in no relation to the rest of the "store."
I think the big screen TV at the end of the Electronics aisle may have been turned so it more easily faces the audience, too.
No dramatically different changes. Say, I've never bothered to study the end credits -- on the "paid for promotion" page, do they also list the companies that have their names mentioned during the opening/on the contestant podia/etc., or do they just list the prize sponsors?
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Scott Robinson