Where in the wiki did you find this information? I just found out that Prosperity is in 2nd edition. I maintain complete rules document on BGG, so I want to know which sets are out in 2nd editions.
I see that you are Norwegian like me (although I live in Mexico now). I'm not a completist like you, although I'm somewhat jealous. It would be nice to have new editions of all the cards, especially Outpost, Masquerade etc. I only bought the base game 2nd edition, and the Intrigue update pack.
I was just in Norway and organized the Dominion Norwegian championships (at Arcon). The last time I organized it, 4 years ago, there were 30 participants, but this year it was sadly only 9. (Maybe because of a huge number of competing events and/or a later time slot...) I guess you couldn't make it? Maybe you're not in Oslo.
We met briefly, actually! I was the guy with that big suitcase containing the complete Dominion collection in Vennerød's room. I couldn't join the tournament, as I was there with my three sons, and the timing of the qualifying event wasn't exactly ideal for small children. I'd love to join next time, though.
The information was found on the 'Second edition' page of the wiki. Now, it says that both Seaside and Adventures are 2e (along with Dominion, Intrigue, Prosperity and Hinterlands), so after the announced Dark Ages update, only the three small expansions, Base Cards and the promo cards will 'need' an update. I hope we'll see an updated Base Cards product as well? If not, I'll have to buy yet another base set (sigh)...
About the promo cards: The wiki stated that these were updated, but when I couldn't find any updated versions on BGG, I contacted RGG. They confirmed that no promos had yet been updated, and that they may never be updated. I updated the wiki, but now the 'Second edition' page says that there have been proofs of 2e promos. Can anyone in the know explain this?