Firs of all thank you for clarification.
The first drop, from 50 to 25 BTC occurred with block 210,000 in November 2012 (nearly four years since block 0). The next drop from 25 to 12.5 BTC will occur with block 420,000, expected around October 2016 (nearly four years since block 210,000), And repeat with the block reward subsidy dropping in half every four years.
October 2016, from what i read the drop expected to be within this year but i still see it's a long run to reach 420k, i think the new mining rigs will affect the speed of this drop.
Also current bitcoins generated "10,828,500" this means we are half way, is the transaction fee planned to be applied after earning coins will stop or this is just a suggestion, if there's no transaction fees or other source of income this will break the whole system.
Thank you again.