Yepp - this would be absolutely stunning!
There are, however, a few things, I would not expect from Ad Astra, since I would think they would not quite fit into the overall setting of Mutant:
- I would not expect any large interplanetary empires. Supposedly, the people living in outer space are "a few leftovers" from the apokalypse, just as any other faction in "Mutant". Therefore, I would imagine the scope of Ad Astra to be somewhat smaller than the one of other space opera. A lot of debris, some more or less undamaged spacestations with a village-sized population, maybe one or two city-sized ones at best.
- I do not expect any intelligent Aliens. Even IF Ad Astra should cover more than our solar system, intelligent Aliens in Ad Astra would feel somewhat off to me "tonewise".
- I do not expect alien worlds to be earthlike, hospitable places. I suppose, most of them will be strange, hostile places, where atmosphere is either not existant or not breathable. If Ad Astra stays within our solar system, this one is pretty much a given, but even when other solar systems could be reached, I suspect worlds there to be just as alien and unpleasant like Mars or Ganymed. The fabled "second earth out there" could be a common starfarer-myth, but I do not think, something else than a distant campain-finale would ever take place there.
My guess would be: Ad Astra will be very much centered on our solar system (even IF there is some form of FTL), with the action taking place on ancient spacestations, moons and asteroids. And I also suspect, there is a reason, why nobody has heared from the Titanpower Mimir in a very long time - either, it was finaly destroyed or - much cooler - the whole spacestation left our solar system as a huge starship, in search of some mythical, faraway Paradiseplanet. And finding Mimir and said Paradiseplanet at the end of some strange, postapocalyptic space-odyssey could be a goal of a Potential Ad-Astra-Campain (Just as finding Eden was the goal of MYZ).