So, Steam has the Digital CE up. $70, includes two copies of Divinity: Original Sin, the Source Hunter DLC pack, plus Beyond Divinity and Divine Divinity.
The Source Hunter DLC pack is available for $10, and it unlocks Divinity Original Sin: The Golden Grail DLC, Divinity Original Sin: Zandalor's Trunks DLC, Divinity: Original Sin Design Documents and Art Pack, and Soundtrack. This appears to be the "upgrade" solution for SEA backers.
So, going the "upgrade" path instead of buying a digital or physical CE will result in less stuff, but a lower total cost of $50. There doesn't seem to be a way to upgrade to the $70 digital package.
I'm a little confused by the "Divinity : OS Design Documents and Art Pack", as that is not included in the physical CE.
Well, spoke too soon. The Source Hunter DLC pack has been removed from Steam, for some reason.
