The Sonic the Hedgehog movie was slated to debut in China on Feb. 28th, 2020, but that's no longer the case. The film has been delayed to an unspecified date, due to theaters in China closing down because of the coronavirus. Paramount has offered up a statement on the film's delay, which you can read below.
Sonic will only be slowing down his pace temporarily, and we look forward to bringing him zooming onto the big screen in China once it is appropriate to do so. As the whole country and world unite together to fight the outbreak of coronavirus, we would like to express our gratitude and respect to all the medical staff, the rescue personnel, and people in service who provide us with much-needed assistance and support during this time.