Every time I read something about it, it's different.

I personally have difficulty envisaging QF being anywhere other than T5 with BA, although it's the only non-BA airline that really needs to be there. BA doesn't work as closely with anyone else. On current schedules, I think that QF only really needs two widebody gates at any one time, so I would imagine that this could be accommodated if BA had the will.

But a QF person told me just last week that they'd read something that suggested that QF won't be in T5 after all. So who knows!