Empires brings back Events. They were fun but I did everything I could think of to do with them in Adventures. But well, this set had new stuff; maybe that new stuff would allow for more Events? In fact of thirteen new Events, nine involve either VP tokens or Debt or both

Triumph has both a Debt cost and a VP token payout. It's like a Victory card that rewards you for getting a lot of cards in one turn, and is represented in your deck with an Estate that you can maybe get rid of. The Debt cost helps you afford it after buying other cards; and hey, if you don't think you're getting another turn, why not go out in Debt and up a few points.
Windfall is one of the four Events that don't involve tokens. If you can manage to get your whole deck into play / your hand / the trash, you can get three Golds for cheap. It's a mini-game.
Dominate is like a new Victory card above Colony - $14 for 15 VP. But instead of a pile, it's just this Event; and you use Provinces for the Victory card, so buying Provinces also runs out the Dominates.
That's it for previews, not counting today's other preview, which is a doozy. We currently expect the set out on May 25, which I believe is when it ships not when it's in stores. I will post the Secret History around when people start to get the actual cards.