Arrested Development (seasons 4-5), on Netflix
The first three seasons aired on Fox. I'd really like to see the continuation, but I have no idea when I might get a chance to do that.

Black Mirror (seasons 3-?), on Netflix
The first two series aired on Channel 4, in the UK. I haven't seen any of the show, so I'd want to watch those seasons (and one special) before watching the continuation.

DreamWorks Dragons, on Netflix
Two seasons of "DreamWorks Dragons" aired on Cartoon Network. (I only managed to see them on DVD.) Six more seasons streamed on Netflix with the subtitle "Race to the Edge." I'm not really sure whether or not to consider that a separate series from the one on Cartoon Network, but at least it's part of the same continuity, even if it's set a few years after the second CN season. Anyway, I have no idea when I might get to see it.

The Expanse (season 4), on Amazon
The first three seasons aired on Syfy. I haven't seen them, and I'm not even sure whether I want to see the series at all. But I wouldn't mind at least checking it out, if I get a chance. And if I like the first season, I suppose I'd want to watch as much of the series as I could, including the fourth season on Amazon (and any subsequent seasons they might make).

Lucifer (season 4), on Netflix
The first three seasons aired on Fox. The fourth season will air sometime in 2019. I have no idea when I might be able to see it.

Mystery Science Theater 3000 (seasons 11-12), on Netflix
The first two seasons aired on The Comedy Channel (now defunct). Seasons 3-7 aired on Comedy Central. Seasons 8-10 aired on Sci-Fi Channel. I don't think I ever saw a full episode of the series on any network, and didn't have much interest in it, when it was on. But when Netflix produced new seasons, I took some interest just because the new cast includes Felicia Day and Patton Oswalt, both of whom I like. So I'd like to at least check the new seasons out, if I ever get a chance.

Star Wars: The Clone Wars (season 6), on Netflix / (season 7), on Disney+
The first five seasons aired on Cartoon Network, but I only got to see the first three seasons. So I'd have to catch up on the seasons I missed before watching the final season.

Veronica Mars (revival), on Hulu
The first two seasons aired on UPN, and the third on The CW. Hulu is doing a limited revival series sometime in 2019, which I definitely want to see. (I'm not sure yet whether it will be considered "season 4" or a separate series.)

Young Justice (season 3), on DC Universe
The First two seasons aired on Cartoon Network, but I only got to see part of the first season. So I'd have to catch up on everything I've missed before watching the web continuation. Which I can't do anyway, since I don't subscribe to DC Universe.