I like to think that logistically, they've thought about the jetbridge / remote parking and have decided to make best use of their infrastructure. (I'm not convinced, but have no info / data to support it.)

The idea of a separate J bus is just a nightmare and I disliked it the few times I've used it as a J pax - I would have preferred to board and have a drink instead of waiting in the terminal. That is just an unnecessary complication. Do away with the premium buses and maybe manage the bus traffic better to (a) minimise the time pax spend waiting for a bus, (b) minimise the bus travel time, and (c) eliminate the confusion around boarding the actual bus (bus doors open / not, wait by the terminal door, now go, but wait, not yet... all that dance)