Modiphius will be releasing a new game called Space 1999, "coming this spring".

Apparently there was a board game by the same name. Anyone know it?

There's a quickstart available at DTRPG.

Late EDIT: The full rulebook has been release, in case someone is interested:

https://legacy.drivethrurpg.com/product/548410/Space-1999-Core-Rulebook-PDF