A new teaser trailer dropped for The Flash season 7 during its panel at DC FanDome.
Executive producer Eric Wallace explained that before they shut down in March, 85% of episode 20 from season six was filmed. It will be used as part of episode 1 of the new season. Wallace hinted that the teaser trailer was cut in a way to mislead and does have huge spoilers within if you look carefully.
Season 7 will return in 2021.