My presumption is that Ed Beach and the bulk of the team are hard at work on VII while Anton and a smaller team take care of remaining VI content.
This.
I can only echo how much I believe
and fear this to be true.
While in theory this growing variety of game-modes sounds innovative and fun, they appear in practice not designed in view of potential imbalances if one were to combine a particular number of them - leaving the question of the AI's (in-)capability to deal with them aside, which is another gripe I have. And before those imbalances would be fixed or the AI would be tought to play effectively within this new environment, the next gamemode is introduced and little attention is seemingly spared to the already released portions of NFP.
While I like and always applaude new civilizations, I cannot help but notice the apparent brevity of the introductory texts or the reuse of already existing 3D-models.
All in all, NFP feels to me, that indeed "Ed beach and the bulk of the team" have moved on to work on CIV VII, whereas some have been left behind (for now) to implement those wild and innovative dreams they had thought about for long individually but never had the chance to pitch them succesfully into a team-effort.
And I sincerely do not mean to disrepect the dev-team in stating this. I know, this is wild speculation. And I feel the passion individual members of the dev-team invested in bringing these game-modes to life. But those particular game-modes feel disconnected, as a lot of loose threads hanging in the air.
I did spent money on the new DLCs and probably am going to buy the rest as well - this is not bad quality, but it is not the quality of content I'd expect, if a full team of a major studio would still be invested in active development.
I had hoped for well-thought, new core-mechanics, like colonisation, vasallisation, economic victory, and so forth. But this, this does not feel like a prolonged interim-period in order to keep us happy until the 3d real expansion drops. To me, it feels like a slow fading out, which is the end.
I'd rather have had the bang which gathering storm was and a release of VII a year earlier or so.