Just to jump in on this, can confirm Brisbane will be allowed to host a Prelim at the GABBA if they earn it. Same as Port at AO.Fages also mentioned last night on AFL360 he expects the preliminary finals to be played in Perth. That's what makes most sense to him.
Hope it's not the case (if we do earn the right to host one, if not then I don't care lol).
The WA/QLD border is scheduled to be fully open in a week and a bit (once we hit 28 days of no community cases, right now we’re at 20) so the winning PF team will be able to fly straight into Perth without quarantining. Also means QLD fans will be allowed to fly over and attend the Grand Final if Brisbane makes it.
Although should note if there’s any community cases of covid in the next 2 weeks, the WA/QLD border won’t change and the game would be relocated.