Unless it has changed again in the last few weeks, the big change seemed to be that it isn't being monitored in terms of movements per hour, but in terms of movements per 15 minutes (as a proportion of the hour).
Sounds good in theory, except because of the "clumping" nature of flights, I would suggest it is actually introducing delays to aircraft in the name of the 80 movement cap, even when such a cap is not in any danger of being broken. I've seen a few longish (20+ minute) delays due to this, and it is very frustrating that you can see that there are no aircraft behind you in the queue to depart (and so the next 15 minute window will be underused, meaning that there will be no danger to the cap).
As Nigel said, its been in for a few months now. And it is a PITA IMHO. The 80 movements should be planning and scheduling purposes only, not operational.
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