I spoke to GAME on the webchat today as I had to change my payment method for my Collectors Edition order. It was very simple to do and the guy changed the order details whilst I was chatting with him.
As for any charge taken off my credit card I have not witnessed any transactions on my account, but that is unsurprising considering the CE is the most expensive version, so it will take longer to process larger payments compared to the cheaper standard and special editions.
On another note, the chap confirmed that "they will ship your game in time for release" so I'm feeling very confident with GAME's service (I must point out that I am using the express delivery method).
Edited by StewartWilson1992, 11 September 2013 - 07:14 PM.