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Sorry mods for making another Pre-Purchase thread but I wanted to make sure this was easy to find as Zavvi is the only retailer selling the CE in the UK.
I spoke with the helpline 5 minutes ago and the agent there advised me that he has been assured that everyone who pre-purchased the game yesterday (including the CE) has had their beta 'package' shipped today via post. I'm not 100% sure if this is being confirmed by email (The volume on the call was terribly low and it was very hard to hear him correctly).
Either way, I double checked and he was adamant that everyone who ordered yesterday will have their codes ahead of time.
Bonus info: They originally had 500 copies of the CE, this sold out in ~20 minutes and they got restocked with an additional 2000 upon request. As far as he was aware there were no further plans to restock the CE so if you are in the UK and on the fence about picking it up it might be an idea to decide sooner rather than later.