They were working on the 43 all along (duh!)
They are getting the tooling for the 421 from Austrains, just upgrade to latest detail level and release
They get the tooling for the 442 and upgrade as above, and now they've got a mech for their GL
They release the 1st series X because they've got the Austrains X class mech anyway
44, 47 and 48 are just straight Traino tooling, acceptable detail and then modify to do later versions (SSR 47 or 49 anyone?)
Oh, and release an SSR GM, S and C Class while you're at it (since they have the tooling)
Maybe upgrade the 80 Class and re-release
Most, if not all locomotives on that list are wrong in some form or way, you might as well just tool new tooling. Austrains 421's have a few large faults to them, as do the 442.
I also wouldn't touch the Auscision GL if the used the Austrains 442 mech. (Never seen so much slop in mechs until buying Austrains)
The 49 and 47, from what I've been told would have to be completely re tooled to do modern versions. I asked TrainO about doing modern versions a while ago on Facebook.
I've always thought the 44 was a perfectly acceptable model as is (save for the gears), and all versions have been done.
Traino have confirmed the SSR GM is being done by themselves on Facebook.
S317 also has a different nose profile after a prang or two under VR so you'd need a new tooling there. S302 has has some mods under WCR/ELZ and would be different again so more retooling
SSR G's? It in theory could happen, but with the whole 1st series T/P class saga kills that idea.
The Austrains C class tooling needs serious updates detail wise (and probably electronically as well)
And from what I know, the 1st Series X classes are brand new from the ground up (maybe except for bogies which are used under B/A classes).
The intelligent modellers have caught on that they are just baiting people for a bite, well because they've learnt it'll happen irregardless of the model being released or not.