I can't reveal too much about myself to avoid any sort of traceback due to a lot of legal stuff. But I am a massive DC fan working for a DC company and knowing information is too hard to keep quiet. I know if I was a fan I'd want to know bits of information about my favourite films but not too much to be spoilt. So here are bits and bobs that I know (not everything is mapped out in the DCCU; a rough outline of the main storyline [Man of Steel, Batman v Superman: Dawn of Justice, Justice League 1 & 2] with the spin off solo outings having more licence of freedom for the respective creative teams). Zack Snyder, David Goyer & Geoff Johns are the head creative team for the DCCU. They have been brainstorming the ideas for the outline storyline much like Kevin Fiege and his team do for the Marvel Cinematic Universe. Johns will be Exec. Producing a lot if not all the films as will Goyer.
Suicide Squad
This film has been in development for some time. David Ayer is Directing and I believe David Goyer wrote a rough story treatment for the film but don't think he will be on scripting duties, he may be producing though. I believe Deadshot is the lead character and leader of the Squad and it also features (and sets up) Amanda Waller in the DCCU who could play a big role in future films. The film will be grounded and gritty and won't feautre 'comicy' villains such as King Shark etc. They will all be humans (some may have powers) with exceptional skills and very bad criminal records. Harley Quinn may be in the film.
Wonder Woman
Goyer also wrote a treatment for this film and may be writing the screenplay for the film. Not too sure on this one plotwise however but a good guess would be that it will be set half in Diana's past and half in the present day with the different time periods linking together for a cohesive story.
Justice League: Part One
The big one. Snyder is directing, Chris Terrio is writing the screenplay from a story by Snyder, Goyer and Terro. The Justice League line up is the same 7 as the New 52. And like the new 52 Cyborg's origin is intergrated into the story. Batman and Superman drive the film forward as the 2 main characters. Brainiac IS the villain and it is one of his drone's that is merged with Victor Stone at STAR Labs and how he becomes Cyborg. Brainiac's aim is to "collect" Superman, the last Kryptonian and also collect Diana and Aquaman before assimilating all of Earth's knowledge and technology before destroying the planet. Expect supporting characters from each of the heroes to be on show. Green Lantern will be Hal Jordan who has already been a Green Lantern for a year or two and returns to Earth to stop the invasion.
The Flash
Will be set after the events of Justice League and Professor Zoom is believed to be the villain with appearances from a couple of rogues. Story will centre a lot on Barry feeling's toward his mothers death when he was younger and possibility that it will hint at Flashpoint being a possible future movie storyline.
Aquaman
Solo outing featuring the full range of Aquaman's impressive supporting cast. Orm is believed to be the central villain wanting to take the Atlantean thrown for himself by working with Black Manta and his army in a story similar to how Dawn of the Planet of the Apes played out replacing Cesar with Orin and Koba with Orm. Studio want a big name director.
Shazam
Will be set in the DCCU. Will be an origin story of Billy Batson that will follow the new 52 origin where he lives with a foster family.
Justice League: Part 2
Darkseid will be the main villain. Again Batman and Superman are the main characters. The film will also deal with other heroes emerging that are capable of appearing alongside the League such as Green Arrow, Captain Atom etc those types of heroes.
Cyborg
Not sure on this movie as I wasn't aware this was happening. Have to do some digging on this but my gut instinct is that this slot may move for another movie (ie Batman solo movie or Superman solo movie)
Green Lantern
I know a fair bit of details on this one. The film will centre on the Green Lantern Corps and will be set entirely in space. The main characters will be a small task force of Green Lanterns who go up against other Corps. There is a plan for multiple human Lanterns. Goyer & Geoff Johns are looking closely at this project.
That's all I have to share right now.