For my wiki work, I try to keep
this page up-to date. It has the changelog for the last bunch of versions (and will for 0.22, probably within the next week or so). Note that these are python and XML changes only; I haven't been putting .dll changes here.
The following text was removed from the original post due to innacuracy:
typically the "full" changelog has a number of features which simply aren't mentioned in the official one.
Edit: So far, most of the items I've found that vary from the changelog are either likely defects, or details underneath the level of the changelog (for instance, every leader's AI change isn't individually mentioned). The most major item I've noted so far is kinda mentioned in the changelog: Hyborem doesn't get Manes until Hyborem builds a city.
Edit 2: still not seeing any major differences from the changelog (I've yet to go through the units, but I've gone through everything else). This changelog is very accurate compared to, say, 0.20 or 0.21. Perhaps the original poster is conflating lines changed with functional differences (for example, there are literally thousands of lines changed to support affinity, even though relatively few units actually use them)?
Edit 3: Hippus War Elephant is now Str 14.