Game revisions (like Alpha, Beta,1.0,1.1,1.2,2.0, etc) would be good for reviews, because the game can change since someone reviewed the game. Even old games have revision (Rev 1, Rev 2, like in the No-Intro notation). It is not a particularly needed data point, but some games change a lot with time.
AdminIGDB (Admin, Twitch) commented
This is a good idea for sure, we've talked about looking at patch notes and updates for games, but it's a bit tricky as there aren;t dedicated sources and also it can vary greatly between new game updates (say, League of Legends new Champions) to simple bug fixes.
Something we would investigate in the future likely.