Yeah we have been using the CDA's at certain airports for a while but its just a test procedure in low traffic times right now, without the accompanied magic that will follow. Its designed to eventually be used in high traffic flow times with the merging and spacing feature on the EFB/ADS-B so we will eventually be responsible for or own separation as well, but thats some years down the road for sure. I have seen the merging and spacing thing in action and its pretty cool, but throw in some wx and it goes out the window. If definately does add to your workload on approach, which is not such great thing.

As for how much fuel it actually saves, I have no idea but I'm sure it will add up.