If you look at the casting lists, it really looks like it's going to be all over the place, too. My guess is we start off with the Butcher of Blaviken and Nennekes place. I wouldn't be terribly shocked if the "present" is Nenneke's and everything is flashback.
They're clearly expanding Yens backstory, so it makes sense that Last Wish will be in there. We saw Brokilon so we know that's there. Child of destiny is in it so I'm sure Duny and Pavetta is there. Might as well shove in the other Ciri story. You can tie up the short stories with a nice little bow if it's really just Geralt and Yen at Nenneke's telling stories to us.