What changed in each Forever beta build
One page per beta build: what Blizzard announced, what shows up in the client, and where the trackers disagree. Talent changes are computed from our own snapshots, not copied from anyone.
We read the trees twice: off the BlizzCon preview, and out of build 1.60.1.70009. The three builds in between - 69893, 69913 and 69977 - we did not read, and no snapshot of them exists here. Everything this page says about them is other people's reporting, marked as such. That is also why the talent diff on the 70009 page covers everything that happened since BlizzCon rather than that build alone.
One page per beta build. What sits under "read from the client" comes from our own talent snapshots in data/talent-snapshots - the same files the calculator is built from. What sits under "reported" comes from other people's builds and is labelled as such, including where those reports disagree with each other.