I'm going to list the players that I think will definitely make the squad if fit (and make themselves available).
GK: Crocombe, Paulsen
DEF: Payne, Bindon, Surman, Pijnaker, Cacace, De Vries
DM: Bell, Stamenic, Rufer
AM: Old, Singh
FWD: Wood
14/23 nailed down. Everyone else there is some level of uncertainty.
Third goalkeeper doesn't really matter. I'd stick with Sail at this point, nobody is unseating the first two, the third GK never plays, so might as well keep continuity and cohesion.
Kirwan the most notable threat to Roux's backup RB spot, with Elliot, Ingham, Sheridan other possibilities.
Boxall, Smith, Hughes, Stanger other options for the 4th CB spot. Boxall the favourite, if he shows no signs of slowing down in the next 12 months.
Thomas to take the 4th DM position if fit. Howieson otherwise. There really isn't anybody else on the horizon.
Attacking midfield, Just is the most likely name I've left off the list. He's just about nailed on but if he is in bad form over the next 12 months it isn't like you can point to the club level he is playing at and say he has to be picked, 2nd div in Austria is worse than the A-League. I really hope he makes a move to a decent club level in the coming off-season. Garbett & McCowatt's places have to be under some threat after their form in this window but are likely to go. Rogerson is probably more in than out too, and that is your 6 likely players for those 3 attacking positions along with the aforementioned Singh & Old. The likes of Randall and Rojas will need very good A-League seasons next year to force their way in (I really hope Marco does that for the Nix). I don't think there is anyone else realistically in the running here.
This most recent window is instructive in that Kosta seems to be considered a Wood backup rather than an option for the 3 positions behind him. He is favourite over Mata and Waine at the moment, if he can keep his current levels of sharpness over the next 12 months. Mata and Waine could easily force their way back in with a decent season though.
Maybe this is sentimental but I particularly hope Kosta, Boxall, Thomas & Rojas make the squad if they can stay fit & play at or near their best over the next 12 months or so. Their rivals for squad places will get other chances. It's surely the last chance for all of them. And experience matters at big tournaments. I think the ABs not playing Ben Smith cost them the 2019 World Cup.