8. Game of Thrones Spinoff
HBO commissioned multiple scripts for five potential Game of Thrones spinoff series, and they've since given one of those projects a pilot order. Starring Naomi Watts in the lead role, the Game of Thrones spinoff, which George R.R. Martin suggested it be titled The Long Night, will take place during the Age of Heroes, almost 10,000 years prior to the events of the main Game of Thrones series. While it will be far removed from the main series, it will still tie into the core events by featuring the founding of notable houses, such as House Lannister, and even possibly depict the White Walkers' first arrival in Westeros. Production has yet to begin, but it's possible that the Game of Thrones spinoff could air sometime in early 2020.
HBO is chock-full of adult dramas, fantasy shows, and comedy series, but it's missing young adult content - and the network plans on remedying that, to an extent, with Euphoria in 2019, which is based on the Israeli series of the same name. Starring Zendaya in the title role as Rue, Euphoria follows "a group of high school students as they navigate drugs, sex, identity, trauma, social media, love, and friendship." Euphoria features an ensemble cast consisting of A Wrinkle in Time's Storm Reid, Maude Apatow, Brian Bradley, Eric Dane, and more.
6. The Nevers
While HBO has been focused on developing American period dramas over the years, they're currently developing a new period piece that takes place in the Victorian era, titled The Nevers. While not much is known about The Nevers - aside from its story following "a gang of Victorian women who find themselves with unusual abilities, relentless enemies, and a mission that might change the world" - the series is officially being helmed by Joss Whedon, who is executive producing, writing, and directing, in addition to acting as the showrunner.
5. The Outsider
There are a number of Stephen King adaptations in the works, for various networks and movie studios, and one of them is landing at HBO, titled The Outsider. It's based on the horror novel of the same name, which was published in May 2018. It didn't take long for the novel to be optioned into a TV miniseries, which is being produced by Jack Bender and Marty Bowen, and will star Ben Mendelsohn, presumably in the title role.
4. The Time Traveler's Wife
One of the highest profile adaptations HBO currently has in the works is The Time Traveler's Wife, which is based on the novel of the same name by Audrey Niffenegger, who is executive producing the series along with Sue Vertue and Brian Minchin. The book was adapted into a movie in 2009, starring Eric Bana and Rachel McAdams, and now it has been given a straight-to-series order from HBO, with Sherlock and Doctor Who showrunner Steven Moffat writing the script for the adaptation. At the moment, no casting decisions or production details have been revealed, but it's a show that's still very much on HBO's radar. With that in mind, it may not premiere in 2019, but it could debut sometime in 2020.
3. Years & Years
A drama that has gone by relatively unnoticed by general audiences is Years and Years, which is a BBC One production that stars Emma Thompson, Rory Kinnear, and Maxim Baldry, and it's being written by Russell T. Davies, who's best known for creating Torchwood and writing episodes for Doctor Who. Precious little is known about the project at this time, but it's being eyed to premiere sometime in 2019 on BBC One, which means its U.S. debut on HBO should follow shortly thereafter.
2. I Know This Much Is True
HBO fast-tracked development on I Know This Much is True in 2017, and they recently gave the limited series the green light and will most likely premiere the show sometime in 2019, if not in early 2020. Starring Mark Ruffalo as identical twin brothers Dominick and Thomas Birdsey, I Know This Much is True is based on the 1998 novel of the same by Wally Lamb, which earned the author widespread acclaim as well as the distinction of being one of the greatest contemporary writers of our time.
1. Catherine The Great
Another project that has been in development for sometime and is of utmost importance to HBO is Catherine the Great, which stars Helen Mirren as the eponymous Empress of Russia, who ruled over the Russian Empire for most the latter half of the 18th century. The upcoming four-part miniseries, which was written by Nigel Williams and directed by Philip Martin, will primarily chronicle the final years of Empress Catherine's reign. It co-stars Jason Clarke, Rory Kinnear, Gina McKee, and many more. While a premiere date hasn't been set yet, HBO plans on airing the miniseries sometime in 2019.