As the title states, personally i'm relieved that there is going to be no-flying on Argus.
For one, it wouldn't make sense to have it there especially since the sky box contains un obtainable places on Argus, just the view that creates the illusion of a broken world, which is awesome and could only really be achieved without flying.
And on another hand is the prospect of some real world PvP once again. Remember how the isle of Quel'danis was? Yeah thats going to be like that on Argus because its a relatively compact world with 3 zones sort of like the isle of Quel'danis. On the isle of Quel'danis there were people engaging in PvP all over the place, especially in the questing areas, and it ended up being some all out zone faction wars. It was pretty amazing. Flying would negate all of that, so for me i'm relieved its not going to be in Argus.