Syfy's Krypton is set for a March 2018 debut, according to Superman fan site KryptonSite. The release month was reportedly given to site owner Craig Byrne by Syfy, who has worked with Warner Bros. in the past.
In addition to that, KryptonSite is circulating a new expanded synopsis for the alien take on the Superman mythos:
Set two generations before the destruction of Superman’s home planet, KRYPTON follows Seg-El (Cameron Cuffe), the legendary Man of Steel’s grandfather — whose House of El was ostracized and shamed. With Krypton’s leadership in disarray, Seg-El encounters Earthly time-traveler Adam Strange (Shaun Sipos) who warns he’s under the clock to save his beloved world from chaos. Fighting to redeem his family’s honor and protect the ones he loves, Seg is also faced with a life and death conflict – save his home planet or let it be destroyed in order to restore the fate of his future grandson.
KRYPTON is from Warner Horizon Scripted Television and is executive produced by David S. Goyer (“Man of Steel,” “Batman v Superman: Dawn of Justice,” “The Dark Knight Trilogy”) through his Phantom Four banner, alongside Cameron Welsh, who serves as showrunner. In addition to Cuffe and Sipos, the show also stars Georgina Campbell (“Broadchurch”), Elliot Cowan (“Da Vinci’s Demons”), Ann Ogbomo (“World War Z”), Rasmus Hardiker (“Your Highness”), Wallis Day (“Will”), Aaron Pierre (“Tennison”) and Ian McElhinney (“Game of Thrones”). Based on the DC characters created by Jerry Siegel and Joe Shuster, KRYPTON premieres in 2018.
Krypton has been filming since late September.