How about that? Ubisoft has stated that all of Rainbow Six Siege's DLC maps will be free of charge to players, in an effort to maintain longevity. A good move on Ubisoft's part, and hopefully more developers will follow suit.
"At launch, Rainbow Six Siege will have 11 maps, playable both day or night, all using the full potential of our Real Blast destruction technology," the publisher said in a statement, "In addition, all post-launch maps will be downloadable for free. We want players to stay with us for the long term and have ambitious post-launch plans that we will detail at a later stage."
Also, Siege is having a closed beta that starts on September 24th. You can sign up for it here.