To clarify the two above imagine it like Fifa or COD where there's a new game near enough 1 per year (or thereabouts) but instead of it being new it's expansions on the old one and you pay per year of updates and content.
^It's not exactly a year, could be 14-16 months. The updates this year have been so big timescales have had to be pushed back a touch as we are only looking at 2.2 in October so there's a good chance 2.3 and 2.4 won't be ready by December for the 12 month bit..
In any case open Horizons on the store page to see whats in game in 2.0 and 2.1 updates, as well as headlines of whats coming in 2.2, 2.3 and 2.4 updates. Patch notes section of the forum will show just how much more than the headline features tend to be put into the updates too.
And welcome to planet landings, try a sidewinder first and watch the gravity
