I bought the regular edition, not knowing how much I'd love the game, and there are no options to upgrade to the better editions. Is this in the works? You can on Steam... :(

Sadly, that option has been in "coming soon" status since the beginning.
Anyway, the goodies does not alter the main game.

having similar problem. I have the "backer edition" nad despite fact that i cna play it, gog library says i do not own a game. All sales, offers and so on says that i can buy any edition, while i do not want to pay full price for a game i own i wish there was an "upgrade" option instead.

Yeah, I know it doesn't affect it...however, I'm a massive fan and want the extras. I made sure on Tyranny to buy the biggest edition, so I didn't run into this again...Just wish I could get my Pillars edition upgraded :(

ah yeah, Gog system is truly bad for special editions likes those offered by developers in the crowdfunding campaigns.
On my case, the edition I got from it is well marked (but maybe because I got the collection edition). Right now, I think the only option is still asking to GOG to do it.

https://www.gog.com/wishlist/games/pillars_of_eternity_upgrade_to_champion_royal_editions