#1 - April 16, 2016, 12:22 a.m.
According to the blog posted by Neva two weeks ago the non-seasonal leaderboard should have been wiped at that point, but it wasn´t. Seems like the 2015 - 4 era still continues (tagged "current").
http://us.battle.net/d3/en/blog/20077425/season-5-ending-soon-3-31-2016
The non-Seasonal Greater Rift Leaderboards will also be wiped at the end of the Season. However, you'll immediately be able to compete in the next Era with your non-Seasonal heroes (including those who have just rolled over), and will not have to wait for the start of the next Season.
Is there a reason why this era did not end alongside season 5?
Thanks in advance for any sort of clarification.