[Update #2]: The Retribution update has now arrived. You can learn a little bit more about it over here.
[Update #1]: Blizzard has now also revealed a new Mei skin - Pajamei! You'll find it, as well as the other four, down below.
Overwatch's Retribution event is set to arrive this April 10th, bringing with it all of last year's content alongside a whole bunch of brand new stuff. As far as new content is concerned, you can expect to see a unique PvE mission starring Genji, McCree, Reaper and Moira, some much-needed balance changes, as well as 60 new cosmetic items and voice lines.
Speaking of which, you might be interested to hear that Blizzard has now released brief teasers for four of the new legendary skins: Talon Sombra,Talon Doomfist, Scion Hanzo and Blackwatch Moira. There doesn't seem to be a way for me to embed the preview videos without having them auto-play, so instead I'll share with you an image of the new skin, as well as a link to where you can see it in action.
And just for good measure, allow me to leave you with a brief teaser trailer for the new Retribution PvE mode. It'll give you a much better look at Moira's new skin, as well as sneak peek at some of the new AI enemies we'll be fighting against. Enjoy!