My reading of the corporate tea leaves re this, is that Frontier will after this season do updates of the core game as and when ready with this being without additional charge, but then release from time to time additional Chargeable DLC packs of content such as Gas Giants, Volcanic planets, or SRV variant packs.
For me this allows Frontier to build out the backbone of the game while still generating significant revenue streams. It also gives them a bit more time to develop the various DLC packs free from external pressures. Internal pressures and deadlines will still be in place, but we the player base wont be adding to it with heaps of Salt.