The Witcher developer CD Projekt is set to announce its "second triple-A RPG in development" during a press conference taking place tomorrow, the studio told Eurogamer.
The briefing will take place at 5pm BST on Facebook.
The new game exists in a "brand new setting" and is thought to feature guns - the listing for the game on CD Projekt's website has a gun icon.
Despite the appearance of console versions of The Witcher: Rise of the White Wolf at an online retailer, CD Projekt says it won't be announcing The Witcher 1 for consoles at the conference.
However, CD Projekt has said it has a The Witcher surprise lined-up in the second half of 2012.