According to NerdLeaks, as reported by Eurogamer, it looks like the wish of a great many Witcher 3 fans is about to come true.
Really, this seems entirely plausible and logical, and we're not even going to categorize it as a rumor right now. A trademark has been filed, and there's even a logo for the game. Since CDPR has already announced they're set to unveil a new game in a genre they've never tried before, all we need to do is sit back and wait until E3.
