Learn English – word that means to see something but not be able to describe

I assume that "the document I am trying to describe is the one with changes to the previous release" means "the document I am trying to describe makes changes relative to the current release and is its successor".

Consider terms like next-generation, successor, in development, next-rev, pre-release, upcoming, and future or future version.

The word jubilee comes from Latin jūbilaeus and from Hebrew yōbēl which means a ram's horn which was used to proclaim the jubilee year.

The word jubilant comes from Latin jūbilāre which meant "to shout for joy."

The roots of the two words are not the same (ref: Chambers dictionary); jubilant is not an adjective for jubilee, in fact the adjective is jubilar (Free dictionary) and the rather uncommon jubilean (Ref: can find this only in OED and I see the red line in my browser even as I type this.).

But in your sentence, you need a term for happy, so it is jubilant that fits well.

Everybody involved in the celebrations was jubilant.