I do believe you are mistaken. The Divine Edition contents haven't changed since the game's launch... everything that's in there now, was already in there on launch date (and believe me, I have been paying close attention, as I have been pressing GOG for several weeks to deliver that exact content to me in my Kickstarter CE edition). See also the original announcement post (OP) in this thread, dated September 14, which already details all the contents of the Divine Edition/Divine Ascension Upgrade: www.gog.com/forum/general/release_divinity_original_sin_2_full_af83c/page1
Anyway, it's good to read that this at least takes care of your concern of missing out on digital content (or being forced into paying extra for it). The whole shipping experience is already bad enough without that.
