Not sure if this counts or not, but there's also the mega-expansion into the witch head nebula, which just borders COL 70. A possible hint of things to come, perhaps?
Whatever FD is doing with the Enclave, whether it's set up for future narrative or not, I have no idea... though strictly speaking nothing about the expansion is related to Col 70.
Personally, I enjoyed the II, though why on earth they're thrusting a significant amount of player activity
right in the midst of permit-locked regions which, as we know, are regions "... earmarked for future content" without
actually unlocking them, I have no idea. It's as if FD are painting themselves into a corner... we knew Barnies had been in Witch Head (and California) for years now... their "discovery" there as part of the II was nothing new.
The whole process where Col 70, witch head, cone sector and greater barnards loop were previously unlocked, and suddenly became locked after an update felt wholly kludgy to me.