Space action Elite Dangerous is coming with Update 13 next week, August 9th, and it will bring the Azimuth saga to a close. Also, the patch will mark the formation of version 4.0.
According to the developers, Horizons and Odyssey currently exist as separate versions of the game: 3.8 and 4.0. The latter contains the core code that supports the Odyssey content and many of the improvements added since the launch of the expansion, while the first version does not. Now the versions will be consistent and further updates will be overlaid on the basis of post-Odyssey (version 4.0).
The authors also plan to make Odyssey free for owners of Elite Dangerous, but not immediately, but some time after the release of patch 13. More details can be found in the official announcement from the developers.