There are no more themes, but lots more cards. The set has 400 cards total, with 6 split piles, 25 regular kingdom card piles, and 23 Allies. 25*11+6*17+23 = 400, and now you know that the only Victory cards are in split piles. So anyway, here are some more cards.
Importer means, you start with 5 Favors, but can't get any more (unless there's another Liaison in the game, obv.). And it gains $5's, slowly. Courier is the Peddler version of Mountain Village, and discards a card to help itself out. Royal Galley plays a card both this turn and next turn; it makes anything else into a Duration.
And two more Allies for good measure. Family of Inventors lowers costs for everyone; fooshing may occur. Gang of Pickpockets is that rare thing, the game attacking the players. You can keep them at bay, or just give in.
Cards will stay playable at
https://dominion.games/ over the weekend. Then they will be gone until... Wednesday, when they'll be available both there and in the Temple Gates Games version on Steam. We expect the physical version to follow at around the same time, but this is much harder to nail down, it depends on lots of different trucks and where you live and stuff. It will be around then though.
And I'll return with Seaside 2E previews around... late April? It's a little hard to pin down just yet.