
The encounter was a four-part mission that took players through a modified King's Row, killing enemy Omnics all the while and completing tasks.

This year the teaser for Uprising was the same as the one the official Overwatch Twitter posted last year, except for a few interesting changes and hints. Some of these hints include a Blackwatch logo and information alluding to the mission in question happening eight years ago instead of seven.
This would mean that the Uprising mission this year might center around something that happened a year before King's Row and involve Blackwatch.

Blackwatch was the covert ops division of Overwatch that was lead by Reaper (Gabriel Reyes) and included heroes McCree, Moira, and Genji.
There isn't a lot of information about Blackwatch in known Overwatch lore, and the backgrounds of those four heroes is still somewhat hazy. I think that it's no coincidence that there happens to be four known heroes with Blackwatch in their pasts.
I think this year the new mission will involve Reaper, McCree, Moira, and Genji, and follow the same four-player PvE format as Uprising with a few changes. Since there's no tank included in the four Blackwatch heroes, it might have to be less of an aggressive encounter with lots of mobs, and more of a secret mission-style encounter with obstacles and mechanics.
If Blackwatch is involved at all with the new Uprising event that will surely shed some much sought-after light on the lore of some key heroes and important details in the history of Overwatch itself. We'll be able to find out first hand on April 10.
Photos courtesy of Blizzard Entertainment