UPDATE 5.1.0
This is the second part of the major 5.X update cycle, the part where everything that's broken should be fixed and everything that's missing should be implemented. It's essentially the flesh to the skeleton that was 5.0.0.
NEW CONTENT
All boss uniques now have their own separate GUIs to allow players to select the boss specific unique they want instead of praying for a specific random drop every single time. Because of this, Ascended items that were previously obtained exclusively as ultra rare boss drops can now be acquired by using Divine Fragments and the soul of the slain boss.
In addition, scrapping these unidentified boss uniques will net you runes, with the amounts listed below:
50 runes - Trials bosses (including Archie)
100 runes - Atlas I bosses
150 runes - Atlas II bosses
225 runes - Atlas III bosses
300 runes - Rifts bosses
...