The French YT channel slipped up and posted a video about the update tomorrow, "Overwatch Insurrection," but they've already removed it
via PCGamer:
The event, which is scheduled to go live tomorrow and will run through May 1, features a four-player PVE fight likely akin to the Halloween Terror event Junkenstein's Revenge. This time around, players will take control of four of Overwatch's early members—Reinhardt, Tracer, Torbjörn, and Mercy—and battle the Omnic insurgency known as Null Sector on the streets of King's Row.
There's a Blackwatch Genji skin too
also skins for Mccree and Widow