The enhancements they're making to NMS appear to be backports from the Light No Fire engine, so my impression is that they are releasing updates to No Man's Sky as a marketing effort while the actual technical work is predominantly on the next game.
> ...my impression is that they are releasing updates to No Man's Sky as a marketing effort...
Given that they don't (often? ever?) advertise Light No Fire alongside the NMS updates, I'd say that the updates into NMS are large-scale playtests of LNF engine updates, game systems, or both, rather than marketing.
> ...my impression is that they are releasing updates to No Man's Sky as a marketing effort...
Given that they don't (often? ever?) advertise Light No Fire alongside the NMS updates, I'd say that the updates into NMS are large-scale playtests of LNF engine updates, game systems, or both, rather than marketing.