Nope, I'm specifically talking about the zone pass. If you go to the website right now, there is no mention of fees for extra days or limits on the number of days covered by the zone pass, that I can see.
Calling it an "Annual camping pass" and no mention of limitations of number of nights seems to make it clear.
I checked the "more information" page, the member agreement, the terms agreement, etc. Only thing I found was restrictions on how many days sequential and park to park rules, and general camping rules.
Now I heard this was a very recent change (like in the past couple of weeks.) And I went to the site to make sure I hadn't misunderstood, and that's how I ended up reading every contract/agreement/terms that I could find short of actually buying.
Your suspicious that I'm confused for the same reason I'm asking the question-- this seems to be a significant change. But if it isn't change then their website seems pretty deceptive at this point.
But if someone can find the terms that lays out the fees for extra days and how many days you get with a zone pass, please feel free to link.