Mushoku Tensei started airing season 2 today.  I'll watch it a little later today, but I really liked season 1 (and the book), so my hopes are high.
The season has officially started.  7 or 8 new shows have already aired so far.
EDIT:   Ok, so I watched the new episode of Mushoku Tensei (episode 00), and it appeared to be filler.  I don't recall ever reading a story like that in the books.  Maybe the author added it later, but it wasn't a piece of the web series that I read originally.  That said, it wasn't "bad", per say, but it isn't what I was expecting.  I look forward to the real first episode, though.