Just did a random check of my exchange and it's saying "AO Accepting Orders which means that the exchange is ready to accept orders from all communications providers for fibre broadband services, such as BT Infinity.
However, this doesn't necessarily mean that you'll be able to get BT Infinity at your property"
So seems like they are just dangling the carrot at the moment. I've signed up for notification of when it's available. Fell sorry for my mother in law who only lives about 200m from the exchange which means she's more than likely directly cabled to the exchange meaning she doesn't have a street cabinet and thus won't be able to get the FTTC service.