There wasn’t a trailer for either series, but there were posters for both.
Here’s the season three poster:
Our family returns!
Season three of The Witcher will apparently loosely follow the events of book two, Time Of Contempt.

That’s probably OK given that it’s set 1200 years before Geralt’s adventures.
Our own world has changed quite a bit in 1200 years, after all.
I will watch Blood Origin for Dylan Moran just like I will watch Rings Of Power for Lenny Henry.
If House Of Dragon wants me to watch, I suggest they cast Bob Mortimer quick.