Nothing much from what I can see. Haven't really been seeing Brietling pieces out in the wild these days.
Are they loosing their popularity?
Was never a fan of their lineup, although I have to admit the Navtimer caught my eye from time to time. But too many people were flaunting them here around NYC and the Jersey Shore so they were not for me. Exclusivity is preferred.
Two local AD's have dropped the line. Ben Bridge and one Mom and Pop B&M are listed as AD's in this area. I don't think there's a big market here. I've had a few but they seemed to have migrated out of the collection.
They tried to get into in house movements. Not sure how successful they were. I DID have one that I regret selling. I still have this SuperQuartz titanium M1 (I think). It's about 10 years old.