Crimson Curse, Gwent's very first expansion since its official release, is set to arrive this March 28th to both PC and consoles. It'll bring with it over 100 new cards, both neutral and faction-specific, as well as a variety of new keywords and abilities to explore.
If you're wondering what these abilities might do, as well as what sort of vampire-themed artwork you can expect to see, you'll find the answers you seek in the recently posted teaser. Have a gander, it's quite a pretty one:
On the other hand, if you prefer not having to rewind the trailer over and over again to figure out what each abilities does, you'll find a quick overview in one of the original announcement posts. As for the cards themselves, CDPR has not revealed all of them just yet, but you can check out a good few of them by visiting the official website. The images are sadly a bit too small to properly enjoy the artwork, but you should still be able to get a pretty good idea of the sort of direction Gwent is going in.
If CDPR decides to releases more major teasers ahead of the March 28th release date, I'll make sure to let you know. Until then, enjoy the current version of Gwent before it gets thrown into utter chaos with the introduction of new cards!