The folks at cdv Software just let us know that, as of today, both the PC and Xbox 360 versions of Divinity II: Ego Draconis have been reduced to a $39.99 price point. The change doesn't appear to be reflected on Amazon yet, but the prices are already live on GameStop here and here.
It's not a huge reduction from what I paid a month ago, but hopefully this helps make the game more appealing to gamers who might not have picked it up otherwise.