My understanding is that everyone who would normally have access to the Qantas lounge (including Gold frequent flyers, Qantas Club members and those eligible for lounge access who are flying Jetstar) will be reacommodated in some way. It may be, however, that not everyone gets sent to the Emirates lounge. Some people might, for example, get sent to the Strata Lounge or given a meal voucher.
I've tried to get further details from Qantas but it seems they are still working through all of this.
