LEGENDS OF TOMORROW DELAYED?

DC's Legends of Tomorrow was initially confirmed to air during the midseason hiatus of Arrow and The Flash, which usually occurs around Dec./Jan. However, the official twitter account for the show's writer's room has stated the show is now slated to air Spring 2016 (with a ?, so even they aren't sure). With characters like A.T.O.M. and Firstorm, plus a heavy focus on time travel, perhaps more time is required to perfect the shows VFX? We should have more concrete information in July at this year's SDCC panel for all of the DC TV shows.