Memory Upgrades in New 27" iMacs?

I understood that the brand new iMac's required screen removal to get at the memory for upgrade. I just read a review on USA Today that said the 27" model has a door on the back, but not the 21.5" model.

Here is the quote: "The iMac isn't big on expansion — you can manually add memory by opening a rear door on the 27-inch model, but not the smaller model."

Here is the review.

Does anybody know for sure whether or not the 27" iMac requires screen removal for RAM upgrades?