I don't understand in the first place why the Govt has "announced" it. If its going to do it, then just get on with it.
Why tell people - defeats the object from a secrecy point of view.
I'm sure all the other countries around the globe who already monitor texts, e-mails etc didn't announce it.
Surely, there is already an element of this going on in our country anyway. I can't prove it, but I bet it happens.
It could of course be an idle threat - they are telling people they are going to snoop on texts,e-mails, phone conversations,etc., but cant afford to set all the infrastructure up to do this, and by the time they can, they will be a shadow govt anyway.
Best test is to see how 2012 Olympics go. Any related incidents etc - maybe why this issue has been "released" in the first place - try to frighten off extremists from doing anything untoward.