I don't think that's ever been fully published, but the most likely match up to what they released I think is:I am interested to know: What's all this talk (in OPs original text - not their message but quotes from others) about 'release 1', 'update 5' etc.? Are these milestones that relate to the current game? If so, how, and how do the quoted release/update numbers relate to current game play numbers/version?
Release 1 = Elite Dangerous 1.0
Update 1 = Horizons (ED 2.x)
not originally planned = Beyond (ED 3.x)
Update 2 = Odyssey (ED 4.x)
Update 3+ = future paid expansions originally planned, current status unknown, planned contents largely unknown
It's possible that at least some of Odyssey was brought forward from Update 3+, or some of what was originally expected to be in Update 2 didn't appear in Odyssey, of course.