Update: We've spoken to Vodafone and got a statement on the subject - apparently the network is 'looking into' how the listing happened.
Vodafone may have accidentally outed a few (admittedly obvious) specs of the new iPhone 5.
According to a listing for its SureSignal network enhancing box, the compatible phones briefly included reference to the iPhone 5 in 16GB and 32GB storage flavours, as well as 'confirming' the device would land in white as well as black.
Quite why a phone wouldn't be compatible with the box when it's got a different colour of chassis, we don't know, but Vodafone has seen fit to list all the options anyway.
As mistakes go, it's a difficult one to work out - it's unlikely those in charge of simply filling in the 'Compatible Phones' section of the SureSignal page are involved in high level conversations with Apple, so this could have been a simple mistake of someone just getting in early.
We've spoken to Vodafone on the matter, and it promises it's 'looking into' the problem.