My wife and I will be on OZ 235 in August and I've just noticed the equipment change on that particular date: 777-200 to 747-400.

I have already made sure that our current seat assignments are fine but now I have a couple of questions:

1) Is it likely that the aircraft type changes again from now until take-off? My concern is that we may end up with inferior seats if that happens and I don't react quickly enough. We're currently booked on 11A/B.

2) How bad is the 747-400 upper deck (C) on OZ? I have the impression that it's pretty dated but I could not find any recent reports on FT. Any pictures would be greatly appreciated.

Thanks!