I'm anxiously awaiting the final season of the expanse. I've watched the first five seasons a couple times now, reading the second book right now. Definitely one of the best sci fi shows in my lifetime, particularly the last couple seasons since Amazon prime picked it up. I don't think I've ever been so excited for an upcoming show.
Also really excited for the witcher season 2. It's been delayed so much, hope they don't screw things up because season 1 was everything I liked.
I heard watchmen season 2 on hbo had been put on hold indefinitely which was disappointing...its been almost three years since season 1 dropped. I really liked the first season, but apparently some viewers are finding a lot of it too controversial at this time.
I was upset when Netflix canceled the second season of the dark crystal. The first season was an awesome resurgence of Henson-style puppetry and I found it quite entertaining, but I can see how it would've missed with most audiences today, specifically young adults as it was geared for.