is this still being worked on?
Yes - to a degree. The current iteration of After\\Burner is "feature complete," and while I might make some future editing adjustments, that is more or less the definitive version.
I'm currently 45% finished with a "Lumen 2.0" version of the rules that have been a long time coming. The new ruleset removes dice for the most part (gasp!) streamlines play, and emphasizes stacking up defenses while bypassing those of opponents for lethal, 1-hit kills.
That's in the works and I really want to get in gear and have that out in some form later this year.