Hello!
Upgrading to the Deluxe Edition after purchasing was/is possible with both Beyond Light and Witch Queen. You can see the current Witch Queen Deluxe Edition Upgrade in your preferred storefront, currently on Steam for $39.99. (4 seasons, dungeon pass etc)
No information beyond the Lightfall preorder page has yet been given, so no Deluxe upgrade for it has yet been confirmed. But given the last two expansions featured that option it's a solid assumption that Lightfall will as well.
PS: The only drawback is I've RARELY seen the Upgrade packages go on sale, even when other editions are.
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thank you. ive got several short weeks at work coming up, along with some screwy car repairs, so this was a breath of fresh air. I had preordered the 90 dollar version of the last two expansions, so i didnt think about it at the time.