At 4.25pm on the 27th January 2017 Frontier confirmed that the Beta for 2.3 (The Commanders) will be available at some point between: Monday 20th February & Sunday 26th February 2017. Its duration has not been confirmed but going by previous releases it could be a month or so in length. It will be available for anyone who has previously purchased the Horizons Beta. Frontier have said they will announce if the Beta will be made available for purchase for people who currently don’t own it. You can read the announcement, here.
Information already known about its content can be seen on the Horizons: Preview page. A new section will be made available on this blog when the information starts to be made available.