Lots of DC stuff affected: https://www.inverse.com/entertainment/the-batman-2021-cancelled-delayed-wonder-woman-1984-the-flash-supergirl-titans-coronavirus
Listing the ones I care about, production for all the entire Arrowverse is halted. The season finales of Flash, Supergirl, and Batwoman are at risk, but Black Lightning and Legends are going on hiatus for a couple of extra weeks. I saw in a different article that Supergirl's season finale only had a couple of scenes left to do so that may be salvageable once the post production people are back but a big ? on what'll happen to the other two, although supposedly there's a rumor for Flash that they'll provide resolution as part of next season's production, and the shows are all renewed, so barring key actors not returning next season that seems like a decent enough solution.
Also, I saw separately that the series finale of Supernatural may not happen because of this.