please read the dominion second edition forum threads. They plan to revise the other sets but no plans for new cards.
I can't predict everything, but as things stand I have no plans to replace cards in the later sets.
Seaside came closest but there were issues with replacing a few of the cards I might have, and overall it just didn't compare to fixing up Dominion and Intrigue.
Okay Alchemy actually has plenty to fix, but it doesn't make sense to take on that project. Alchemy has some vocal fans who want to see more potion stuff, but there are enough people that just don't like the potion premise (separate from the other issues, mainly being too slow of a set) that it would just never make sense to work on fixing Alchemy rather than any other project I might work on.
Instead there could have been 1-2 new cards in each of 4-6 expansions, with a single upgrade pack with all of the new cards. That's not perfect - maybe you bought a mix of new and old sets and the upgrade pack is half redundant for you. But uh it's an idea to toss around. And well I didn't end up doing it. We're revising all the sets from Seaside to Adventures (as described in the OP), but without new cards.