Yeah, I mostly check the in-game Codex, and EDSM search only if I wish to find how many more lifeforms there are (other than the one first found) and where. New variants of existing stuff do pop up from time to time (last one in the middle of November, maybe?), but for entirely new stuff, it seems we're either through them all, or Frontier hid them much too well.
However, the fact that the Codex has had no rumoured entries for over a year, and no other hints either, leds me to conclude that the most likely scenario is that we've consumed either most or all of the new exploration content Chapter Four has added.
However, the fact that the Codex has had no rumoured entries for over a year, and no other hints either, leds me to conclude that the most likely scenario is that we've consumed either most or all of the new exploration content Chapter Four has added.