The "ex-Witcher devs" thing definitely has my interest piqued. I'm curious to know how much staff overhaul CDPR have experienced over the last few years. Would go some way towards understanding whether it's a couple of folks who left CDPR, vs a Bioware style exodus (no pun intended) where pretty much everyone who made the previous games great has left or been pushed out.
Definitely felt like a Witcher cinematic, if they can take the world and character building from that franchise too then they'll be onto something, too early to tell much right now but an interesting enough premise.
