The information is obtained through an interview with CD Projekt RED members. The game is more advanced then Cyberpunk 2077, however both will not be done in 2013...
The Polish studio explain that they are working on another game besides Cyberpunk 2077. They have said to be planning to do so in the past, but now the process has actually begun. The title of the not announced game would be Dark Fantasy. According to CD Projekt RED, the game is further along the development stage than Cyberpunk 2077.
The fantasy title could be a sequel to the hugely popular The Witcher 2, however the studio has not said anything about it. CD Projekt has previously stated that it is possible that they will be making a sequel to The Witcher 2, but that it is also possible that they will be working on something new and fresh. It seems like they have now made up their mind, and have started to develop the game, whichever it may be.
Both games will not appear in 2013, and will be released on the next-gen consoles. The PS3-version of The Witcher 2 will also not appear in the PS3, and will be released on the next-gen consoles as well.
Would you prefer a Witcher sequel or a new game from CD Project studio?