I am wondering since some of my old mains have it, where did the rare and ultra rare liberated borg Doffs you could buy from Roxy the General DS9 Omega vendor go? Are they are a casualty of the season 7 update or are they being added in a later patch? I ask because some of my new alts would love to have them in their roster.

At the moment they are a casualty of season 7. I would be surprised if they didn't come back in some form or another. If not a doff, then as a reputation ability.

Shame, hate to see such good Doffs that the developers put so much time into go to waste, I am sure if they wanted to they could find a way to reintroduce them all back into the rep store or via some other manner..

I'm really hoping they'll be reintroduced soon; I've sadly neglected my duty officers (I hadn't even noticed I could assign them for combat bonuses until recently!) so I was hoping to get my hands on some of the rare and very rare borg duty officers.