The game out at 21 October 2016 for PC.
You can order the game from steam store it will be available It will be available at a price of $ 60 .
"On 05/04/16, starting at, 01:30 Pacific Time (08:30 UTC), ranked queues will be disabled in preparation for patch 6.9. At 03:00 Pacific time (10:00 UTC), the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 3 hours."
The official administrator team of Rainbow Six Seige announced the new Dlc Operation Dust Line.It will be available in may.