A really big retcon would be, when they eradicate everything that happened in The Dragon Knight Saga in favor of a more Sourcefocused-story.
Did they really eradicate it? I didn't think DKS was at odds with the other Divinities, just that it was a particular tangent in pursuit of Divinity's "main quest". It's just one that focussed on Champions and Dragon Knights and so on rather than Source, but that doesn't necessarily diminish the significance of the latter.
Nono, they didn't do it, sorry if I wasn't clear^^.
I just wanted to explain what for me would be a real retcon. We only had elves for two games in minor roles, but we already played two Dragon Knights in two games, so it would be big retcon, if they just cut out the importance of the Knights on Rivellons history.