That Trigan Empire opening was a bit odd. The implication is that these are the records of a now dead race. Uhhhh... yeahhhh...
The other thing I found interesting was them showing the aliens to be bigger than humans, not that that had any bearing on the stories that were told.
"Well, you've established they were giants, now what?"
"Nothing. All the animals and plants on their world is proportionally giant size too, so it's just like they were normal humans!"
Sounds like its assumed from the age of the space craft and the immense distances that any civilization that many light years distant would have become extinct before the craft reached Earth.
The twelve foot tall aliens remind me of the film "Gods of Egypt".
Giant humanoids are found in many of our myths, so the possiblity of these being visiting aliens has been explored in many stories and films like "Prometheus".
Perhaps they would have gotten round to humans making contact with survivors of the Trigon. The frozen alien crew might be revived somehow. Plenty of open ends to tie up.
If the 2009 film project were revived they'd likely have found some way for humans to get into the picture.
In any case it sounds like an interesting series.