I'm not so sure, actually. Everyone here seems to be fixed on the idea that either the PL will win this case or City will. I don't concur. The Panel could quite easily determine that APT rules as a matter of generality are legally acceptable, but that the way in which they're currrently implemented isn't. Quite possibly neither party would be entirely satisfied with that.
It could mean that, while some of the aspects of the APT rules that City find most objectionable might be struck out, we may have to continue to put up with others that stick in our craw. Meanwhile, the PL could find some of the key regulatory planks it felt were desirable for it to deal with this issue removed, while being vindicated in terms of the overall principle and some other aspects of the regulatory specifics.
So it might not be quite as black and white as many people are making out in terms of one party losing and the other winning. Who would be more satisfied with a 'halfway house' decision as described above depends on where the line is drawn, but, as I've said, it's entirely feasible that neither party would be all that happy.