Blood shard costs are 5x higher, to keep the same reward per shard we raised drop rates by 5x as well. Then after that we further raised the legendary chance by another 33%. The chance to get a legendary from Kadala is now 10%. Since the system is random players will inevitably go on streaks but over the course of time all players move towards the average and that average is now 33% more items than before.
Based on that, you can backtrack those steps to figure out what it was before - 33% increase of a 7.5% drop chance is the resulting (current) 10%, and then 1/5 of 7.5% is 1.5%.
We spent some shards (a couple of thousands )
İ think the new drop rate is nearly %10
Old one is %1.5-2
A little more chance upgrade than cost
İt seems that drop chance become %20 higher per shard
http://www.diablofans.com/blizz-tracker/topic/57572-travis-day-on-the-kadala-change
Based on that, you can backtrack those steps to figure out what it was before - 33% increase of a 7.5% drop chance is the resulting (current) 10%, and then 1/5 of 7.5% is 1.5%.
http://us.battle.net/d3/en/profile/Spiral-1401/hero/65250518
Thanks