The player guidance in "The Witcher 3: Wild Hunt — Ballads of the Past" will be handled by the quest designer from GTA 6

There’s almost nothing official about the supplement "Ballads of the Past" for the immortal The Witcher 3: Wild Hunt. No press release, no trailer — only a small, curious entry on LinkedIn.

Guillermo Díaz Barquín shows up there as lead quest designer at Fool's Theory for the past 1.5 yrs, and the new content (including "Ballads of the Past") is listed under his supervision. He’s working remotely from Spain — yes, remote, if that matters to you.

Earlier in his CV he spent roughly the same amount of time at Tequila Works; prior to that he logged 6+ yrs at Rockstar, where he’s listed as Sr. quest designer on GTA VI. Take it as a single corroborating detail rather than a full reveal.