In that case its a nothing document and little will change apart from airlines scribbling out some new forms to give reasons why you don't need to do it.
If you read the document you will see that it's the airport operator, not the airlines, that can propose alternative means of compliance with the separation criteria, to be accompanied by the safety case which needs to include historical data on the number and severity of previous heavy/heavy wake turbulence incidents, which the CAA will then "consider" before deciding whether an exemption can be granted.
So by no means a "nothing document".