From what I know Dust and the proposed Dust Tactics were never an actual Rackham project/property.
I think the designer of Dust the boardgame works/worked/did some work for Rackham but Dust was a private sideline project he did with the creator of the Dust 'verse - Paolo Parente.
The Rackham connection goes that far other than Dust Tactics was going to use a licenced version of AT-43 rules.
Though I stand to be corrected.
I assumed that FFG might pick up the distribution of Dust Tactics because they distribute the English version of Dust the boardgame. That's why I'm hoping that FFG might be able to give us the nod.
I regularly check the Dust official website but they've not posted anything new for the best part of a month now. They've posted a whole load of concept graphics which are great but no solid news for a while.