Canon UK issued a message to owners of the 650D indicating that the rubber grips will turn white due to a bad batch of rubber they used for some cameras, this batch may also cause allergies. Canon offers on their website a place to input the serial number of the unit so you can see whether you are affected or not. If your unit is affected, Canon will replace the front of the cameras and the grips free of charge.
Now you're buying a very expensive product, would you like it to be defective right before you opened the box? I'm not sure about your feelings about warranty repairs but my experience is that whenever something is opened by a technician, it is not the same quality anymore. Expect issues to happen from that point.
So if you're that kind of person, you'll be quite annoyed to know that Amazon will only replace your unit ONCE, if the second unit they send you is affected, they WILL NOT replace the unit. I can confirm this because it happened with me. Amazon just refuses to replace it. They gave me a partial refund, which is okay, but a few months from now, I'll have to take the camera to the technician to be fixed, and my camera won't have that original sealing it had from the factory. You just can't replicate the same build quality from a factory in a shop, no matter what they tell you.
So your options are, not to buy from Amazon, go to the high-street and check the camera, take a smartphone and input the serial number into Canon's website and see if it's affected, or buy the camera and suffer the consequences of bad repairs later...
I personally believe that Amazon should stop selling this model until Canon only has good ones in their warehouses. Amazon made me wait three weeks for the replacement, only for me to find that it was plagued by the same issue.
Here's the address to the page on Canon's website that explains the issue in details:
Here is the page where you can input your Serial Number to see whether your unit is affected or not.
PLEASE WRITE A RESPONSE ABOUT YOUR AMAZON.CO.UK-BOUGHT CAMERA ONLY! I'm trying to see whether Amazon is selling a lot or only a few of the affected units, so please write whether your unit is affected or not.