My little contribution to this guess/rumorathon is this.
I have transsferred 2 Endeavour sets from Lithgow to Eveleigh after crew training.
They were 2808 and 2814 + mates on 2 seperate occassions over 2 weeks.
They are just "Endeavours" nothing special, normal hard smeg seats.
No-one at EXPSC has been told or saying (If they know) which set will be used on the Bathurst service.
Nor do they they know anything about retro fitting new seats OR any other creature comforts.
Now to take 1, 2- car set and say it can be used exsclusively on that run with its comfy seats etc, is near Impossible.
As the Bathurst service Might/will be a normal Endeavour set things often go wrong which require overnight servicing/repair at Eveleigh.
In this case what do you do?
Swing a spare set over with hard seats? Doubt it.
Time will tell but I would expect that if one Endeavour train is upgraded more than 1 set will need to be done.
As for the poster above claiming that Endeavours and Explorers are the same, well
Things like door operation and crewing procedures are not,
Not a huge issue but this would need to be addressed.
Thank you for the information