Two things, one, I'm really happy to be here and can't wait to hear what you all have to say! two, this is my first time posting a discussion so it may not be as good as everyone else's. Anyway, here we go.
Superman
Superman had a kinda rocky start, but I think we're finally picking up! The future of the comic includes Kryptonite being introduces, Kenny Braverman becoming Conduit, Brainiac making his first appearance, and the introduction of Kandor and the DC U version of the character Commander Gor. Future arcs which I haven't planned out completely will have Parasite and Bruno Mannheim appear.
Batman
So the names of the two unwritten arcs show that Scarecrow and Riddler will appear, no hiding that. But other villains who will appear are Catwoman, Poison Ivy, Killer Croc, and yes, the Joker. Dick Grayson will also appear, though I am going to skip Robin and go straight to Nightwing. Bruce will also create an alter ego for himself, and claim to be his own long lost grandson, pretending his name is Bruce Wayne, Jr.
Wonder Woman
This is going to be a short one, sorry about that. In Wonder Woman I will introduce Giganta, who is going to have a kinda strange origin in this version. Also in Wonder Woman, I am going to introduce reincarnation.
The Flash
I have very big plans for the Flash! in the Flash, I'm going to introduce the Rogues, Grodd, Reverse-Flash, time travel, alternate universes, and I'm even going to hint towards Flashpoint! Wally West will also appear, he is a mix of both the New 52 Wally and the Pre-52 Wally. Barry himself will get his costume in the next arc, though it won't be the usual Flash costume.
Green Lantern
So I haven't made Green Lantern yet. That's mainly because I'm still planning everything through. I haven't finished everything, but I can tell you what I have so far. Mela is going to be trained by Kilowog, Sinestro was banished form the Lanterns years ago, and the Manhunters are going to appear early on.
Aquaman
In Aquaman, Orm is going to be crowned the king of Atlantis, and his brother isn't really happy, like in the usual story. Though in this version Orin doesn't become a villain until later on. Also, the Trench are going to play a very big part in the first few arcs, and there's going to be a massive twist about Orin which causes him to become the Ocean Master.
Justice League
Darkseid, Starro, Legion of Doom, and more will appear in this one! another plan I have is to introduce the Multiverse, and the Crime Syndicate, though obviosly that won't come for a bit.
Random
These are just some things I don't know where to put. The Monitors will appear, and yes, that does mean the Anti-Monitor will also show up at some point. I'm going to have more comics when I get far enough in to the universe, some of the comics I want to introduce are Blue Beetle, Green Arrow, Doom Patrol. There will also be an upcoming limited series called Future's End U. Yes it's based on something kinda mediocre, but I think Future's End had some potential in it.
Also, some of you know about massive plot points in the comic, and I ask you nicely not to tell anyone about them. If you have any questions please feel free to ask them.