Okay. Hellenic, Turkic, Anglic, it's all Greek to me
Weak attempt at humor.
BUT ANYWAYS...
All I know of the alien modules are the Classic ones, and the Mongoose ones. Plus GURPS' Sword Worlds module -- which is excellent and canonical.
First, what is the
purpose of Yet Another alien module covering a major race? It's a supplemental market, isn't it? But T5 has yet to push out the rest of its ruleset. And, anyway, do you really want Traveller to be in competition with itself (T5 vs. Mongoose)?
Maybe you think that's a poor comparison -- maybe you don't like the way Mongoose covered the Vargr, or Aslan, for example. That's an opportunity to
fix the Mongoose text into a
Version 2.0, not write a competing product.
Here's the thing. Mongoose has a staff of professionals, and a yearly pile of budget to produce all sorts of stuff. Their potential of producing a quantity of supporting material is
much better than FFE. And they're licensees.
The opportunity, then, the best route -- in fact, probably the only route at this time to get some of what you want -- is to let Mongoose produce background material, and benefit from Traveller, regardless of version. This is good business for Mongoose, FFE, and Traveller as a whole.
Thus I see the alien books being produced by Mongoose, and not FFE.
What about a third party/fan licensee? ...you may ask. I would say that it is possible: DGP carried Traveller for years. Now ask, is it likely? I would say "not likely to happen". But it's a possibility. But note the professionalism of DGP -- they're more like Mongoose or Steve Jackson Games than just a random couple of fellows writing books while they hold down a day job.
So we're dealing with probabilities, which is why I suggest that Mongoose is the current outlet for supplemental material: they have the license and the pipeline. Maybe in the next 10 years Steve Jackson Games will re-take the premier spot. Right now, though, it's Mongoose.