I wonder if there are any target date for 2.0 release. even a ballpark would be very useful
... yes, would be helpful to know: perhaps I want to skip migration from 0.9 to 1.x but jump to 2.x, if it's not too far in the future.
Check the roadmap for 2.0 https://github.com/elastic/elasticsearch/issues/9970
The first beta for 2.0 was being announced at https://www.elastic.co/blog/elasticsearch-2.0.0.beta1-coming-soon