Sounds to me like they are still going ahead with the change but not enforcing it at the moment, however when they do we will be well outside our time period for canceling.
If i recieve the proposed text message i will be canceling, its not about weather they will charge me, but that they will have the right to in future if we agree to the new terms by not canceling within 14 days of receiving of the change in the T&C's

We will have to see what the text actualy says