First of all I'm a blind dummy, the sets were visible for a long time and some of you probably knew about it. Since during last few days there was a post about Gear Sets and Customization i decided to make combined one with my findings.
The class and talent specific sets are shown in the talent tree. The interesting part is that there are some pieces that don't match. They are either different class sets or skin variations of the sets that we can see in talent tree. You can see that with Trickster set (helmet with gogles) and Technomancer (armor from Technomancer reveal, the gas mask one)
Problem is that with trickster it looks like Variation but Technomancer set looks brand new.
About the non class specific sets - there are some armor pieces that look like part of set but it's unknown if it's just visual effect or if it's full on gear set with specific bonuses (we know that there are sets bonuses for having 3 class set pieces).
Edit2: The non class specific sets seem to have no set bonuses.
About the armor sets being "epic" instead of "legendary" it seem that we will have to upgrade their rarity somehow. Screenshots above were taken form video posted on 28th of May and Pyro Broadcast where we can see purple items was posted later on 2nd of July. So my theory about simple mistake seem no longer to be reasonable.
Pyromancer sets Edit4: Other Legendary set that I found
I also recommend watching Release Date Trailer to see more for yourself, there were some set like armors but I wasn't able to get clear screenshot because of blur.
While it's not a big reveal I hope that for some it will be something new.
Edit:typo
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