Though it was initially reported that Suicide Squad 2 was going to shoot sometime Mid-2018, it looks like production had to be held back since Will Smith, won't be available to shoot earlier in the year.
According to Variety's Justin Kroll, production will be expected to begin fall of 2018 because Will Smith will be busy working on Guy Ritchie's live-action adaptation of Aladdin. Smith will be playing the role of the Genie, which was made popular by Robin Williams way back in 1992.
Even if Suicide Squad was panned by critics, a lot of people still agree that Will Smith still brings his natural charisma with his role of Deadshot. DC seems to want to focus on villain-centric movies as well, with a Harley Quinn/Joker movie in the works as well as Gotham City Sirens coming from original Suicide Squad director David Ayer.
Going back to Aladdin though, it seems that Disney is confident in pushing forward with their animated adaptations thanks to the ridiculous success of Beauty and the Beast. No offense to Smith, but I don't think he can pull off the amazing range that Robin Williams did with his version of the genie. Then again, he'll probably just make his own spin on the character, and he'll be likeable enough.
No official release date has been announced for Suicide Squad 2 or the live-action Aladdin.
See Also: DCEU: Gotham City Sirens Is NOT Cancelled; Possible Storyline of Harley Quinn/Joker Movie