Movies:
Godzilla: King of the Monsters Trailer. If you love kaiju (giant monsters), you're probably already excited about this. If not, check out the trailer and tell me this doesn't at least look incredible.
Aquaman Trailer. Reactions to this seem pretty split. I don't think it looks terrible, but I haven't been impressed by DC's offerings in their extended universe yet.
Shazam! Trailer. This is the DC movie I'm actually interested in. Looks fun and I'm interested how this plays out in-universe.
Glass Trailer. Unbreakable was my favorite superhero movies before there were so many, so I'm excited to see this continue the characters.
TV:
Invader Zim: Enter the Florpus (TV Movie on Nickelodeon). Easily the thing that got me the most hyped that would take the longest to explain. Invader Zim is great TV show that you can currently watch on Hulu if you have a subscription.
Nightflyers (SYFY).
Deadly Class (SYFY). Syfy killin' it on the trailers, yo.
Infinity Train (Cartoon Network). This short got my interest. Now let's see what comes of it.
Iron Fist Season 2 (Netflix). This looks... good? The first season was disappointing, but if we get a great arc out of it, I will forgive. But I won't forget, Danny.
Doctor Who (BBC America). i'm a huge Doctor Who fan, and this season is a new Doctor, new show runner, new companions, new stories. Looks like it will be a bit easier for new fans to get into this very... very... very long running series.
There is also a Roswell reboot, a Charmed reboot, a Buffy reboot, as well as not-reboots Good Omens, Umbrella Academy, and continuations of all of the CW hero shows and Cloak & Dagger's season 2 announcement.
Comics:
The Vision is going to return as a standalone series at Marvel after an acclaimed first run.
Hal Jordan is going to return as the Green Lantern at DC this November after being on the sidelines.
Marvel is doing Digital short comics, and DC is launching a whole universe with comics, movies, and tv all in one place.