An inspector calls (less as it costs money) ~
So, if you manage to get outstanding, which from personal experience is not as big a mystery as it may seem. You will not get inspected again unless your data slips or there are 'reported concerns'.
If your centre is good, it will go from 3 year intervals to 5 years, those that are satisfactory get the normal three year cycle and those who are week get more visits (where the latter two are no different than before).
With this in mind, i wonder what the incentives may be?
Is the inspection body under pressure to adapt the metrics to ensure there are more grade 1, outstanding schools. This will reduce costs as well as show that during the term of this current government there is an overall increase in the number of schools getting better inspection results as a direct result of their 'intervention'.
Those who are good, will have the time to 'improve', saving cash and enabling the inspection body to 'prove' they are in a process of helping the continual rise in standards.
The rest, now nothing has changed, but on the grapevine (so subjective information i am afraid), i hear that many satisfactory and unsatisfactory schools are being forced to become academies. Not that there is a hidden agenda here.
I will rant some other time on the changes in certifications and qualifications as this is interlinked into the bigger picture. But currently, if your local school miraculously gets outstanding, please stop and think about who this actually serves.