Although not officially announced, recent digging from avid players through the PTR files on PC revealed a mysterious event_6 which many speculated to be the new Overwatch Anniversary Event. Add this to the discovery of unlisted Xbox anniversary loot boxes and a cryptic response from the official Overwatch twitter account, all the clues have all but confirmed an upcoming Overwatch Anniversary event is in the works.

Blizzard has kept their lips sealed regarding event_6, but it's impossible to escape the scrutinizing eyes of fans.

It was previously revealed that the Anniversary Loot Boxes are potentially carrying as many as 100 new items which would include new anniversary skins, sprays, highlight intros, poses, voice lines, and icons. So to get more information, Reddit user ethanciavo went back through the PTR files and was able to datamine some new, previously unreported information about the upcoming event_6 (as well as some other new goodies).

Anniversary event related:

  • 5 new items each for Reaper, Mercy, Torbjorn, Reinhardt, Winston, Widowmaker, Zenyatta, Roadhog, McCree, Junkrat, Sombra, Ana, Orisa
  • 6 new event items each for Tracer, Hanzo, Pharah, Bastion, Symmetra, Genji, Zarya, Soldier, Lucio, D.Va, Mei

The following are mostly speculation:

  • Season 5 sprays and icons (non-hero specific) (4)
  • New Anniversary event profile icon (1)
  • New Anniversary icons/sprays (2)
  • Potential new Lootbox tier for credit, or a new credit mechanic
  • Changes to Lijiang Tower which may be in preparation for the new event Arcade game mode.

Non-Anniversary related items:

  • New Sombra emotes (2)
  • New Orisa emotes (2)

*Sombra and Orisa emotes most likely the sit and laugh emotes promised by Blizzard

  • New Tracer emotes (2)
  • New Reaper emote, victory pose, spray

Overwatch was officially released last year on May 24, 2016, so we may see an announcement about it very soon.  The last event was Uprising which ended May 2 and came with the release of 114 new uprising items.

Source: Reddit