Gillian's left the band. And that's that. Picked up an Aussie mage whilst Down Under - can't remember which, Rolling Stone perhaps? (I left all me cuttings on a bloody plane!) - and it basically said as much in black & white. Though why there's no official line on this, I don't know.
I think it's safe to assume that PC is, in fact, 'Here To Stay'.
Johnny G ran into the pair at Adelaide airport and commented that their nipper looked in good health!
PS. Gillian was at the Adelaide and Perth shows...
PPS. There may well have been a roadie doing some tuning at the Hordern show perhaps, but Steve was defo the drummer on the night. If you get the angle right on the stage you can see Barney and Phil's geetar roadie 'wigging out' to the far left of the stage during songs when he's tuning, so he almost resembles a fifth member of the band!