Ambush Alley Games is following up the popular Force on Force modern warfare rules with a built-from-scratch sci-fi ruleset. The goal was to leave scale and choice of minis up to players, and focus on a "hard" sci-fi feel of potentially possible high tech rather than a "fantasy in space" approach.
The date has slipped due to printing problems. However, there has been an update to the cover art:
Original cover art:
As a purely optional inclusion in the book, AAG are including a setting and factions with a storyline that players are encouraged to use or not as they wish. Personally, I am looking forward to picking up some 1/144 (12mm to maybe 15mm) minis when this comes out- I've been looking at the Critical Mass Games minis as well as the Heavy Gear Blitz lines. Another option is trying out some 28mm minis I have with this system.
Tabletop wargames: Age of Sigmar, Battletech, Force on Force, Infinity, Malifaux, WH40k. RPGs: D&D 5e, Pathfinder (1e & 2e)
Well, because Force on Force (FoF) and Tomorrow's War (TW) are quite flexible, the choice is yours in terms of the scope of the scenario. As you might expect, one will be limited by the size of the available gaming surface, number of available minis and of course, play time.
Personally, looking at the way FoF is set out, I would say anything up to multiple platoon level warfare is possible in an evening of gaming. The scenario games in FoF cover a wide range, from 12 strong fire teams facing off (a recreation of an encounter during the Falklands war) to larger scale clashes with several platoons and vehicles involved (Chechen conflict recreation). Any scale and make of minis can be used, which gives one a lot of options in the choice of minis.